Brent Allen Holtz

Farm Advisor

Cooperative Extension San Joaquin County
2101 East Earhart Avenue, Suite 200
Stockton, CA 95206
(209) 953-6124
baholtz@ucanr.edu

http://cesanjoaquin.ucanr.edu

Biography

Brent Holtz has been an Orchard Systems Farm Advisor for the University of California for 31 years and served as County Director in San Joaquin County’s UC Cooperative Extension office for 15 years. Brent was raised on an almond ranch in the Northern San Joaquin Valley, attended schools in California: Modesto Junior College (A.S.), California Polytechnic State University, San Luis Obispo (B.S.), and earned both M.S. and Ph.D. degrees in Plant Pathology from the University of California, Berkeley. Following graduation in 1993, Brent was a post-doctoral research associate with Dr. Themis Michailides at the University of California, Davis, before becoming the Orchard Systems Farm Advisor in Madera County in 1994.

Brent's research and education programs are focused on growing almond and pistachio in the San Joaquin Valley of California, helping growers in production agriculture find more sustainable farming practices without compromising product quality or yield. Brent is currently leading a research effort on whole orchard recycling (WOR) where removed orchards are ground-up and incorporated into the soil to increase soil organic matter and soil water holding capacity, instead of being burned in the field or a co-generation facility (‘Resilience: the whole orchard recycling origin story’). Brent served on San Joaquin County’s Agricultural Advisory Board and the San Joaquin Farm Bureau Federation Board of Directors for 15 years. Brent is currently serving on the California Clean Biomass Collaborative, with a mission of finding alternatives to agricultural burning.

Education

Ph.D. Plant Pathology, UC Berkeley. 1993

M.S. Plant Pathology, UC Berkeley. 1989

B.S. Biology, California Polytechnic State University, San Luis Obispo. 1986

A.A. Science and Mathematics, Modesto Junior College. 1983

Awards

2024 Almond Technical Achievement Award
Presented by Almond Board of California, https://www.almonds.com/almond-industry/industry-news/dan-cummings-and-dr-brent-holtz-honored-almond-industry-awards, 2024
UC ANR Distinguished Service Award-Outstanding Research
Presented by University of California Agriculture and Natural Resources, https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=60208, 2024
Finalist, Friends of Agriculture
Presented by Friends of Agriculture, 2002
Proclamation of Achievement Award
Presented by Madera County Board of Supervisors, 2002
National Achievement Award, Albuquerque, New Mexico,
Presented by National Association of County Agricultural Agents, 2001

Specialty

Pomology, deciduous tree fruits and nuts, plant pathology, Whole Orchard Recycling

Areas of Expertise (click to see all ANR academics with this expertise)

Bibliography

Peer Reviewed

Culumber, M., Gao, S., Poret-Peterson, A., Thao, T., Zuber, C., Camarena-Onofre, D., Perez, J., Hendratna, A., Holtz, B.A., 2025. Impact of whole orchard recycling on greenhouse gas emissions, soil carbon storage, and almond productivity in a replanted orchard, Agriculture, Ecosystems & Environment Volume 389, 109664, ISSN 0167-8809, https://doi.org/10.1016/j.agee.2025.109664
Hana You, Paul Martinez, Mae Culumber, Brent Holtz, and Astrid Volder. 2025 Wood Chip Incorporation in Almond Orchard Planting Berms Increased Gravimetric Water Content, Soil CO2 Efflux, and Fine Root Length Density. HortScience 60(2):237-244. https://doi.org/10.21273/HORTSCI18212-24
Thao, T., Culumber, C.M., Poret-Peterson, A.T., Zuber, C.A., Holtz, B.A., Gao, S. 2024. Evaluating the seasonal effects of whole orchard recycling on water movement and nitrogen retention for a newly established almond orchard: simulation using HYDRUS-1D. Agriculture Water Management, 299, 108882, https://www.sciencedirect.com/science/article/pii/S0378377424002178
Maguvu, T., Frias, R., Hernandez-Rosas, A.I., Holtz, B., Niederholzer, F.A., Duncan, R.A., Yaghmour, M.A., Culumber, C.M., Gordon, P.E., Rolshausen, P.E., Adaskaveg, J.E., Lindow, S.J., Trouillas, F.P. 2024. Phylogenomic and comparative genomics of Pseudomonas syringae associated with almond (Prunus dulcis) in California. PLOS ONE 19(4): e0297867. https://doi.org/10.1371/journal.pone.0297867
Phoebe E. Gordon, Natalia J. Ott, Raman K. Brar, and Brent A. Holtz, and Greg T. Browne. 2024. Phosphorus fertilization can improve young almond tree growth in multiple replant settings. HortTechnology 34(2):161-171, https://doi.org/10.21273/HORTTECH05143-22
Suduan Gao, Aileen Hendratna, Touyee Thao, Mae Culumber, Amisha Poret-Peterson, Cameron A.T. Zuber, and Brent A. Holtz. 2024. Influence of woodchip size and nitrogen fertilization on carbon dioxide and nitrous oxide emissions from soils amended with orchard biomass. Soil Science Society of America Journal, 1-13, https://doi.org/10.1002/saj2.20650
Holtz, B.; Culumber, M.; Zuber, C.; Browne, G.; Doll, D.; Jahanzad, E.; Yaghmour, M.; Niederholzer, F.; Gordon, P.; Poret-Peterson, A.; Gao, S.; Gaudin, A. 2024. Whole almond orchard recycling and the effect on second generation tree growth, yield, and soil fertility. Acta Horticulturae. 1406, 217-224, DOI: 10.17660/ActaHortic.2024.1406.33
https://doi.org/10.17660/ActaHortic.2024.1406.33
Maguvu, T., Frias, R., Hernandez-Rosas, A., Holtz, B., Culumber, M., Niederholzer, F., Duncan, R., Yaghmour, M., Gordon, P., Rolshausen, P., Adaskaveg, J., Lindow, S.E., Trouillas, F. 2024. Comprehensive phylogenomic and comparative genomic analysis of Pseudomonas syringae associated with almonds in California. Acta Horticulturae 1406, 337-344, DOI:10.17660/ ActaHortic.2024.1406.48
https://doi.org/10.17660/ActaHortic.2024.1406.48
Mohamed T. Nouri, Sampson Li, Renaud Travadon, Brent A. Holtz, and Florent P. Trouillas. 2023. First Report of Cytospora azerbaijanica Causing Cytospora Canker and Shoot Dieback on Peach (Prunus persica) in California, U.S.A., Plant Disease, First Look, May 2023, American Phytopathological Society, ISSN: 0191-2917, e-ISSN: 1943-7692, https://apsjournals.apsnet.org/toc/pdis/0/ja
Coyne, K. 2023. Thinking big about recycling: for the growing practice of orchard recycling, the story just keeps getting better. CSA News published by Wiley Periodicals inc. on behalf of American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, ISSN 1529-9163, eISSN 2325-3584, 27 February 2023, https://doi.org/10.1002/csan.20966
Haviland DR, Symmes EJ, Adaskaveg JE, Duncan RA, Roncoroni JA, Gubler WD, Hanson B, Hembree KJ, Holtz BA, Stapleton JJ, Tollerup KE, Trouillas FP, Zalom FG. Revised continuously (recent 2022). UC IPM Pest Management Guidelines: Almond. UC ANR Publication 3431. University of California Division of Agriculture and Natural Resources, Oakland, CA, http://ipm.ucanr.edu/PMG/pmgchanges.html
Khalsa, S.D.S., Rivers, D.J., Holtz, B.A., Brown, P.H. 2022. Effects of organic matter amendments on soil nutrient availability and tree nutrient status in California almond, Proc. IX International Symposium on Mineral Nutrition of Fruit Crops. ISHS 2022, Eds.: A. Dag et al., DOI 10.17660 , Acta Horticulturae 1333.7: 51-57.
Jahanzad, E., Brewer, K.M., Poret-Peterson, A.T., Culumber, C.M., Holtz, B.A., Gaudin, A.C.M. 2022. Effects of Whole Orchard Recycling on Nitrate Leaching Potential in Almond Production Systems. Journal of Environmental Quality, American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, https://doi.org/10.1002/jeq2.20385
Poret-Peterson, Amisha T., Jahanzad, Emad, Gaudin, Amelie C.M., Culumber, C. Mae, Gao, Suduan, Holtz, Brent A. 2021. Whole orchard recycling as a practice to build soil organic carbon in the San Joaquin Valley, California, USA. 2021. In Food and Agriculture Organization of the United Nations (FAO) and Intergovernmental Technical Panel on Soils (ITPS) (Eds.) Recarbonizing global soils: A technical manual of best management practices, Volume 4. Cropland, Grassland, Integrated systems and farming approaches – Case-studies. Food and Agriculture Organization of the United Nations, Rome, Italy, pages 515-546, ISBN:978-92-5-134897-0, https://doi.org/10.4060/cb6598en
Smith, Evie E., Brown, Patrick H., Andrews, Ellie M., Shackel, Kenneth A., Holtz, Brent A., Rivers, Daniel J., Haviland, David R., S. Khalsa, Sat Darshan. 2021. Early almond harvest as a strategy for sustainable irrigation, pest and disease management. Scientia Horticulturae Volume 293 5 February 2022, 110651, ELSEVIER, https://doi.org/10.1016/j.scienta.2021.110651
Holland, L.A., Trouillas, F.P., Nouri, M.T., Lawrence, D.P., Crespo, M., Doll, D.A., Duncan, R., Holtz, B.A., Culumber, C.M., Yaghmour, M., Niederholzer, F., Lightle, D., Jarvis-Shean, K.S., Gordon, P.E., Fichtner, E.J, 2020. Fungal Pathogens Associated with Canker Diseases of Almond in California. Plant Disease, Published Online:5 Aug 2020https://doi.org/10.1094/PDIS-10-19-2128-RE
Emad Jahanzad, Brent A. Holtz,Cameron A. Zuber, David Doll, Kelsey M. Brewer, Sean Hogan, Amélie CM. Gaudin 2020. Orchard Recycling Improves Climate Change Adaptation and Mitigation Potential of Almond Production Systems. PLoS ONE 15(3): e0229588. https://doi.org/10.1371/journal.pone.0229588, is a peer-reviewed open access scientific journal published by the Public Library of Science, ISSN 1932-6203, LCCN 2006214532
G.T. Browne; N.J. Ott; A.T. Poret-Peterson; B. Lampinen; S.G. Metcalf; M.A. Yaghmour; B. Holtz; M. Culumber; G. Brar; and D. Doll. (2018). Anaerobic soil disinfestation as an alternative to soil fumigation for management of Prunus replant disease: effects on tree growth and yield. ISHS 2018, DOI 10.17660, Acta Horticulturae 1219: 287-294.
Holland, Leslie; Nouri, Mohamed Taieb; Crespo, Maria; Holtz, Brent; Yaghmour, Mohammad; Doll, David; Trouillas, Florent. (2018). First report of Collophora hispanica and C. paarla causing branch cankers of almond in California. Plant Disease. APS Journals. 102:8, 1663. 3/6/2018. https://doi.org/10.1094/PDIS-09-17-1518-PDN
Holtz, B.; Browne, G.T.; Doll, D.; Culumber, M.; Yaghmour, M.A.; Jahanzad, E.; Lampinen, B.; Gaudin., A. (2018). Whole almond orchard recycling and the effect on second generation tree growth, yield, light interception, and soil fertility. Acta Horticulturae. ISHS. 1219, 265-271. https://www.actahort.org/books/1219/1219_41.htm
Holtz, Brent A. (2017). Almond Orchard Recycling: The Slasher could improve soil fertility, Resource: engineering and technology for a sustainable world. Resource: engineering and technology for a sustainable world. American Society of Agricultural and Biological Engineers (ASABE). 24:4, 8-11. www.asabe.org/Resource
Bentley WJ, Caprile JL, Coates WW, Day KR, Hembree KJ, Holtz BA, Van Steenwyk RA, Adaskaveg JE, Baldwin RA, Gubler WD, Hilton R, Kelley KA, Stapleton JJ, Westerdahl BB. Revised continuously (most recent 2017). UC IPM Pest Management Guidelines Apricot. UC ANR Publication 3433. Oakland, CA, http://ipm.ucanr.edu/PMG/pmgchanges.html
Bentley WJ, Day KR, Duncan R, Giraud DD, Hembree KJ, Holtz BA, Johnson M, Lanini WT, McKenry MV, Niederholzer FJA, Shrestha A, Westerdahl BB, Adaskaveg JE, Gubler WD. Revised continuously (most recent 2017). UC IPM Pest Management Guidelines Plum. UC ANR Publication 3462. Oakland, CA, http://ipm.ucanr.edu/PMG/pmgchanges.html
Haviland, David R.; Bentley, Walter J.; Siegel, Joel P; Holtz, Brent A.; Daane, Kent M.; Higbee, Bradley S.(2016). Navel Orangeworm and Obliquebanded Leafroller, in Pistachio Production Manual. University of California, Agriculture and Natural Resources, Publication.L. Ferguson and D. Haviland. 3545, 197-210.
Klonsky, Karen M.; DeMoura, Richard L.; Beede, Robert H.; Holtz, Brent A.; and Ferguson, Louise. (2016). Production Costs, in Pistachio Production Manual. University of California, Agriculture and Natural Resources, Publication.L. Ferguson and D. Haviland. 3545, pages 11-16.
Holtz, Brent A.; Parfitt, Dan E.; Ferguson, Louise (2016). Rootstock Production and Propagation, in Pistachio Production Manual. University of California, Agriculture and Natural Resources, Publication.L. Ferguson and D. Haviland. 3545, pages 75-82.
Holtz, Brent; Teviotdale, Beth L. (2016). Soilborne Diseases, in Pistachio Production Manual. University of California, Agriculture and Natural Resources, Publication.L. Ferguson and D. Haviland. 3545, 257-264.
Holtz, Brent A.; Doll, David A.; Browne, Greg. (2016). Whole orchard recycling and the effect on second generation tree growth, soil carbon, and fertility. Acta Horticulturae. International Society of Horticultural Science. 1112, 315-319.
Kallsen, C.E.; Parfitt, D.E.; and Holtz, B.A. (2014). Comparisons of bloom and harvest dates, alternate bearing index and and nut quality parameters of ‘Golden Hills’ and ‘Lost Hills’ pistachio cultivars to ‘Kerman.’ Proceedings of the sixth international symposium on Almonds and Pistachios. Acta Horticulturae. 1028, 279-284.
Holtz, Brent A.; Doll, David; Browne, Greg (2014). Orchard carbon and nutrient recycling. Proceedings of the sixth international symposium on Almonds and Pistachios. Acta Horticulturae. 1028, 347-350.
Browne, G.T.; Lampinen, B.D.; Holtz, B.A.; Doll, D.A; Upadhyaya, S.K.; Schmidt, L.S.; Bhat, R.G.; Udompetaikul, V.; Coates, R.W.; Hanson, B.D.; Klonsky, K.M.; Gao, S.; Wang, D.; Gerik, J.S.; and Johnson, R.S. (2013). Managing the almond and stone fruit replant disease complex with less soil fumigant. California Agriculture. 67:3545, 128-138. July-September. californiaagriculture.ucanr.edu
Parfitt, D.; Kallsen, C.; Holtz, B.; and Maranto, J. (2010). ‘Randy’ male pistachio. HortScience. 45:7, 1113–1115.
Holtz, B.A., Martin-Duvall, T., Haanen, D.M., and Lindow, S.E. 2009. Biological control of Fire Blight in the San Joaquin Valley of California, 2008. Plant Disease Management Reports 3:PF0121, American Phytopathological Society, APSnet, St. Paul, MN, http://www.plantmanagementnetwork.org/.
Holtz, B.A., Martin-Duvall, T., and Haanen, D.M. 2009. Control of Alternaria Late Blight on pistachio in the San Joaquin Valley of California, 2008. Plant Disease Management Reports 3:STF025, American Phytopathological Society, APSnet, St. Paul, MN, http://www.plantmanagementnetwork.org/.
Kallsen, C.E.; Parfitt, D.E.; Maranto, J.; and Holtz, B.A. (2009). New pistachio varieties show promise for California cultivation. . California Agriculture. 63, 18-23. http://CaliforniaAgriculture.ucop.edu
Martin-Duvall, T., Holtz, B.A., Haviland, D.R. 2008. Mite management in almond (Prunus dulcis), 2007. Pacific spider mite: Tetranychus pacificus McGregor, Twospotted spider mite (TSSM): Tetranychus urticae Koch, Arthropod Management Tests, Volume 33 (D6), Entomological Society of America, http://www.entsoc.org
Hotlz, B.A., Martin-Duvall, T., and Haviland, D.R. 2008. Navel Orangeworm control in pistachio (Pistachio vera L), 2004, Navel orangeworm (NOW): Amyelois transitella (Walker), Arthropod Management Tests, Volune 33 (D7), Entomological Society of America, http://www.entsoc.org
Hotlz, B.A., Martin-Duvall, T., and Haviland, D.R. 2008. Navel Orangeworm control in pistachio (Pistachio vera L), 2005, Navel orangeworm (NOW): Amyelois transitella (Walker), Arthropod Management Tests, Volune 33 (D8), Entomological Society of America, http://www.entsoc.org
Hotlz, B.A., Martin-Duvall, T., and Haviland, D.R. 2008. Navel Orangeworm control with hull split sprays in almond, 2006. Navel orangeworm (NOW): Amyelois transitella (Walker), Arthropod Management Tests, Volune 33 (D9), Entomological Society of America, http://www.entsoc.org
Parfitt, D.; Kallsen, C.; Holtz, B.; and Maranto, J. (2008). “Lost Hills”: a new pistachio cultivar. Hort Science. 43:1, 247-249.
Adaskaveg, J.E.; Driever, G.F.; Gubler, W.D.; Forster, H.; Holtz, B.; Wade, L.M. (2008). Detection of Erwinia amylovora strains with reduced sensitivity to currently registered antibiotics and management of fire blight of pome fruits using Kasugamycin in integrated strategies. Acta Horticulturae. 793, 375-382. http://www.ishs.org
Holtz, B.A.; Martin-Duvall, T.; Adaskaveg, J.E.; and Lindow, S.E. (2008). Efficacy of bactericides and biological antagonists for the control of fire blight of apple in the San Joaquin Valley of California. Acta Horticulturae. 793, 445-450. http://www.ishs.org
Lindow, S.E.; Holtz, B.A.; Elkins, R.E. (2008). Improved biological control of fire blight of pear and apple by introduction of antagonistic bacteria to unopened flowers. Acta Horticulturae. 793, 451-456. http://www.ishs.org
Holtz, B. A. and T.M. Martin-Duvall. 2007. Evaluation of fungicides for control of brown rot on almond, 2006. Plant Disease Management Reports 1:STF005,American Phytopathological Society APSnet, St. Paul, MN, http://www.plantmanagementnetwork.org/.
Holtz, B. A. and T.M. Martin-Duvall. 2007. Evaluation of fungicides for control of shot hole on almond, 2006. Plant Disease Management Reports 1:STF006, American Phyto-pathological Society, APSnet, St. Paul, MN, http://www.plantmanagementnetwork.org/.
Holtz, B. A. and T.M. Martin-Duvall. 2007. Evaluation of fungicides for control of peach leaf curl on nectarines, 2006. Plant Disease Management Reports 1:STF007, American Phytopathological Society, APSnet, St. Paul, MN, http://www.plantmanagementnetwork.org/.
Holtz, B.A., and Martin-Duvall, T. Evaluation of fungicides for control of scab on almond, 2007. Plant Disease Management Reports 2:STF015, American Phyto-pathological Society, APSnet, St. Paul, MN, http://www.plantmanagementnetwork.org/.
Holtz, B.A., Martin-Duvall, T., and Adaskaveg, J.E. Evaluation of fungicides for control of powdery mildew on almond, 2007. Plant Disease Management Reports 2:STF018, American Phytopathological Society, APSnet, St. Paul, MN, http://www.plantmanagementnetwork.org/.
Kallsen, C.; Parfitt, D.; and Holtz, B. (2007). Early differences in the intensity of alternate bearing among selected pistachio genotypes. Hort Science. 42:7, 1740-1743.
Holtz, B. A. and Hoffman, E. W. 2006. Evaluation of fungicides for control of brown rot on almond, 2005. Fungicide and Nematicide Tests Vol 61:STF002, 1 page, APSnet, http://www.plantmanagementnetwork.org/, St. Paul, MN.
Holtz, B. A. and Hoffman, E. W. 2006. Evaluation of fungicides for control of almond scab, 2005. Fungicide and Nematicide Tests Vol 61:STF014, 1 page, APSnet, http://www.plantmanagementnetwork.org/, St. Paul, MN.
Adaskaveg, J.; Gubler, D.; Forster, H; Erickson, E.; Hoffman, E.; and Holtz, B. (2006). Evaluation of new bactericides for control of fire blight of pears caused by Erwinia amylovora. . Acta Horticulturae. 704, 277-282.
Holtz, B.A; and Hoffman, E.W. (2006). Predicting the occurrence of fire blight using leaf wetness in the San Joaquin Valley of California. Acta Horticulturae. 704, 187-190.
Bentley, W.; Pickel, C.; Hasey, J.; Coviello, R.; Viveros, M.; Holtz, B.; Andris, H.; Duncan, R.; Johnson, M.; and Van Sickle, G. (2006). Seasonal guide to environmentally responsible pest management practices in peaches and nectarines. UC ANR publication. 21625.
Holtz, B. A. and Hoffman, E. W. 2005. Evaluation of fungicides for control of brown rot on almond, 2004. Fungicide and Nematicide Tests Vol 60:STF007, 2 pages, APSnet, http://www.plantmanagementnetwork.org/, St. Paul, MN.
Ma, Z.; Yoshimura, M. A.; Holtz, B. A.; and Michailides, T. J. (2005). Characterization and PCR-based detection of benzimidazole-resistant isolates of Monilinia laxa in California. Pest Management Science. 61, 449-457.
Holtz, B. A.; Caesar-TonThat, and; T. McKenry, M.V. (2005). Wood chipping almond brush and its effect on soil and petiole nutrients, soil aggregation, water infiltration, and nematode and basidiomycete population, Options Méditerranénnes Série A., M. Cordeiro. 63, 247-256.
Holtz, B. A. and Hoffman, E. W. 2004. Evaluation of fungicides for control of brown rot, 2003. Fungicide and Nematicide Tests Vol 59:STF011 (online), 2 pages, The American Phytopathological Society, APSnet, http://www.apsnet.org/, St. Paul, MN.
Holtz, B. A. and Hoffman, E. W. 2004. Evaluation of fungicides for control of almond scab and shot hole, 2003. Fungicide and Nematicide Tests Vol 59:STF012 (online), 2 pages, The American Phytopathological Society, APSnet, http://www.apsnet.org/, St. Paul, MN.
Holtz, B.A.; McKenry, M.V.; and Caesar-TonThat, T.C. 2004. Wood chipping almond brush and its effect on the almond rhizosphere, soil aggregation, and soil nutrients. Acta Horticulturae 638:127-134, ISSN:0567-7572, ISBN: 90 6605 707 6.
Holtz, B. A.; and Caesar-TonThat, T. (2004). Wood chipping almond brush to reduce air pollution as a sustainable alternative to burning that enhances soil quality and microbial diversity. Emerging Concepts in Plant Health Management. R. Caesar. Research Signpost. 159-185.
Holtz, B.; Lindow, S.E.; Teviotdale, B.L.; and Hoffman, E.W. 2002. Enhancing flower colonization of the biological control agent Pseudomonas fluorescens strain A506, and the efficacy of Apogee and Serenade, for fire blight control in the San Joaquin Valley of California. Acta Horticulturae 590:319-324.
Buchner, R.P.; Connell, J.H.; Holtz, B. A.; Olsen, J.L.; Olson, W.H.; and Reil, W. 2002. Leading edge of plant protection for walnut, almond, pecan, hazel, and pistachio production. HortTechnology 12(4):613-614.
Holtz, B. A. 2002. Pistachio Seedling blight. Pages 70-71 in Compendium of Nut Crop Diseases in Temperate Zones. Edited by Teviotdale, B. L., Michailides, T. J., and Pscheidt, J. W., Eds. American Phytopathological Society (APS) Press, St. Paul, MN.
Holtz, B. A. 2002. Plant protection for pistachio. HortTechnology 12(4):626-632.
Holtz, B.A.; Teviotdale, B.L.; and Hoffman, E.W. 2002. Predicting the occurrence of fire blight in the San Joaquin Valley of California. Acta Horticulturae 590:167-174.
Zeng, Q.; Brown, P. H.; and Holtz, B. A. 2001. Potassium fertilization affects soil K, leaf K concentration, and nut yield and quality of mature pistachio trees. HortScience 36(1):85-89.
Kallsen, C. E., Holtz, B. A., Villaruz, L., and Wylie, C. 2000. Leaf zinc and copper concentrations of mature pistachio trees in response to fertigation. HortTechnology 10(1):172-176.
Hong, C. X., Michailides, T. J., and Holtz, B. A. 2000. Mycoflora of stone fruit mummies in California orchards. Plant Dis. 84:417-422.
Holtz, B. A.; Teviotdale, B.; Turini, T. 1999. Comparison of models to predict the occurrence of fire blight in the San Joaquin Valley of California. Acta Horticulturae 489:437-444.
Zeng, D. Q.; Brown, P. H.; and Holtz, B. A. 1999. Effects of potassium fertilization on soil potassium distribution and balance in pistachio orchards. Better Crops 83(4):24-26, http://www.ppi-ppic.org.
Zeng, D. Q.; Brown, P. H.; and Holtz, B. A. (1999) Potassium fertilization and diagnostic criteria for pistachio trees. Better Crops 83(3):10-12, http://www.ppi-ppic.org.
Holtz, B. A.; Michailides, T. J.; and Hong, C. X. (1998). Development of apothecia from stone fruit infected and stromatized by Monilinia fructicola in California. Plant Dis. 82:1375-1380.
Hong, C. X.; Michailides, T. J.; and Holtz, B. A. 1998. Effects of wounding, inoculum density, and biological control agents on post harvest brown rot of stone fruits. Plant Dis. 82:1210-1216.
Klonsky, K.; Beede, B.; Ferguson, L.; Freeman, M.; Hendricks, L.; Holtz, B.; Kallsen, C.; Sibbett, S.; Livingston, P. (1998). Sample costs to establish a pistachio orchard and produce pistachios. Acta Horticulturae 470: 481-492.
Hong, C.X.; Holtz, B. A.; Morgan, D.P.; and Michailides, T. J. (1997). Significance of thinned fruit as a source of the secondary inoculum of Monilinia fructicola in California nectarine orchards. Plant Dis. 81:519-524.
Holtz, B.A.; Michailides, T.J.; Ferguson, L.; Hancock, J.G.; and Weinhold, A.R. (1996). First Report of Rhizoctonia solani (AG-4) on Pistachio Rootstock Seedlings in California. Plant Dis. 80(11):1303.
Free, S. J.; Holtz, B. A.; and Michailides, T. J. (1996). Mating behavior in field populations of Monilinia fructicola in California. Mycologia 88(2):208-211.
Holtz, B. A.; Karu, A. E.; and Weinhold, A. R. (1994). Enzyme immunoassay for detection of Thielaviopsis basicola. Phytopathology 84:977-983.
Holtz, B. A.; and Weinhold, A. R. (1994). Populations of Thielaviopsis basicola in San Joaquin Valley field soils and the relationship between inoculum density and disease severity of cotton seedlings. Plant Dis. 78:986-990.

California Agriculture Article Contributions

Managing the almond and stone fruit replant disease complex with less soil fumigant

ANR Workgroup Associations

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