Publications - Faculty Publications - Dr. Lavern W. Timmer

Refereed Papers

Zhang, J. and L.W. Timmer. 2007. Preharvest application of fungicides for postharvest disease control on early season tangerine hybrids in Florida. Crop Protection 26: 886-893.  PDF

Peres, N.A., R. Harakava, G..C. Carroll, J.E. Adaskaveg, and L.W. Timmer. 2007.  Comparison of molecular procedures for detection and identification of Guignardia citricarpa and G. mangiferae.   Plant Dis. 91: 525-531. PDF

Mondal, S.N., A. Vicent, R.F. Reis, and L.W. Timmer. 2007.  Saprophytic colonization of citrus twigs and factors affecting survival of conidia of Diaporthe citri, the cause of melanose.  Plant Dis. 91: 387-392.  PDF

Hyun, J. W., Peres, N. A., Yi, S. Y., Timmer, L. W., Kim, K. S., Kwon, H. M., and Lim, H. C. 2007. Development of PCR assays for the identification of species and pathotypes of Elsinoë causing scab on citrus. Plant Dis. 91: (in press).

MacKenzie, S.J., T.E. Seijo, D.E. Legard, L.W. Timmer and N.A. Peres 2007. Selection for pathogenicity to strawberry in populations of Colletotrichum gloeosporiodes from native plants.  Phytopathology (accepted).

Mondal, S.N., A. Vicent, R.F. Reis, and L.W. Timmer. 2007. Efficacy of pre- and post-inoculation application of fungicides to growing leaves for control of melanose, scab, and Alternaria brown spot.  Plant Dis.  (accepted)

Peres, N.A., S.J. MacKenzie, T.L. Peever, and L.W Timmer.  2007.  Postbloom fruit drop of citrus and Key lime anthracnose are caused by distinct populations of Colletotrichum acutatum.  Phytopathology (in preparation).

Agostini, J. P., N. A. Peres, S. J. Mackenzie, J. E. Adaskaveg, and L. W. Timmer.  2006.  Effect of fungicides and storage conditions on postharvest development of citrus black spot and survival of Guignardia citricarpa in fruit tissues.  Plant Dis. 90: 1419-1424. PDF

Chen, H.-Q., K. L. Dekkers, L. Cao, J. K. Burns, L. W. Timmer and K. R. Chung.  2006.  Evaluation of growth regulator inhibitors for controlling postbloom fruit drop (PFD) of citrus induced by the fungus Colletotrichum acutatum.  HortScience 41: 1317-1321. PDF

Mondal, S. N. and L. W. Timmer.  2006.  Relationship of the severity of citrus greasy spot, caused by Mycosphaerella citri, to ascospore dose, epiphytic growth, leaf age, and fungicide timing.  Plant Dis. 90: 220-224.

Golmohammadi, M., M. Andrew, T. L. Peever, N. A. Peres, and L. W. Timmer.  2006.  First report of brown spot of tangerine hybrid cultivars Minneola, Page and Fortune caused by Alternaria alternata in Iran.  New Dis. Rep. 12: 2005-98.

Reis, R. F., L. W. Timmer, and A. de Goes.  2006.  Effect of temperature, leaf wetness, and rainfall on the production of ascospores of Guignardia citricarpa and on black spot severity.  Fitopatol. Bras. 31: 29-34.

Peres, N. A. and L. W. Timmer.  2006.  Alternaria brown spot of citrus in Brazil:  Evaluation of the Alter-Rater for spray timing and effects on yield of Murcott tangor.  Crop Prot. 25: 454-460.PDF

Marín, J. E., H. Fernández, N. A. Peres, M. Andrew, T. L. Peever, and L. W. Timmer.  2006. First report of Alternaria brown spot of citrus caused by Alternaria alternata in Peru.  Plant Dis. 90: 686.

MacKenzie, S. J., D. E. Legard, L. W. Timmer, C. K. Chandler, and N. A. Peres.  2006.  Resistance of strawberry cultivars to crown rot caused by Colletotrichum gloeosporioides is nonspecific.  Plant Dis. 90: 1091-1097.

Reis, R., S. N. Mondal, T. Shilts, F. C. Brentu, and L. W. Timmer.  2006.  Effect of lesion age, humidity, and fungicide application on sporulation of Alternaria alternata, the cause of brown spot of tangerine.  Plant Dis. 90: 1051-1054.PDF

Masunaka, A., K. Ohtani, T. L. Peever, L. W. Timmer, T. Tsuge, M. Yamamoto, H. Yamamoto, and K. Akimitsu.  2005.  A citrus field isolate of Alternaria alternata producing two distinct host-selective toxins ACT- and ACR-toxins.  Phytopathology 95: 241-247. PDF

Dalkilic, Z., L. W. Timmer, and F. G. Gmitter.  2005.  Linkage of an Alternaria disease resistance gene in mandarin hybrids with RAPD fragments.  J. Am. Soc. Hortic. Soc. 130: 191-195. PDF

Peever, T. L., L. Carpenter-Boggs, L. W. Timmer, L. M. Carris, and A. Bhatia.  2005.  Citrus black rot is caused by phylogenetically distinct lineages of Alternaria.  Phytopathology 95: 512-518. PDF

Mondal, S. N. and L. W. Timmer.  2005.  Ascospore deposition and epiphytic growth in relation to fungicide timing for control of greasy spot rind blotch caused by Mycosphaerella citri.  Plant Dis. 89: 739-741. PDF

Chen, H.-Q., L. Cao, K. A. Dekkers, L. W. Timmer, and K.-R. Chung.  2005.  A gene with domains related to transcription regulation is required for pathogenicity of Colletotrichum acutatum causing Key lime anthracnose.  Mol. Plant Pathol. 6: 513-525. PDF

Albrigo, L. G., H. W. Beck, L. W. Timmer, and E. Stover.  2005.  Development and testing of a recommendation system to schedule copper sprays for citrus disease control.  J. ASTM Int. 9(2): 2(9): 1-12. online: DOI: 10.1520/JAI 12904.

Mondal, S. N., A. Bhatia, T. Shilts, and L. W. Timmer.  2005.  Baseline sensitivities of fungal pathogens of fruit and foliage of citrus to azoxystrobin, pyraclostrobin, and fenbuconazole.  Plant Dis. 89: 1186-1194. PDF

Peever, T. L., G. Su, L. Carpenter-Boggs, and L. W. Timmer.  2004.  Molecular systematics of citrus-associated Alternaria spp.  Mycology 96: 119-134. PDF

Peres, N.A.R., N. L. Souza, T. L. Peever, and L. W. Timmer.  2004.  Benomyl sensitivity of isolates of Colletotrichum acutatum and C. gloeosporioides from citrus.  Plant Dis. 88: 125-130. PDF

Mondal, S. N., J. P. Agostini, L. Zhang, and L. W. Timmer.  2004.  Factors affecting pycnidium production of Diaporthe citri on detached citrus twigs.  Plant Dis. 88: 379-382. PDF

Peres, N.A.R., N. L. Souza, and L. W. Timmer.  2004.  Evaluation of systems for timing of fungicide sprays for control of postbloom fruit drop of citrus in Brazil.  Plant Dis. 88: 731-735.

Mondal, S. N., D. S. Howd, R. H. Brlansky, and L. W. Timmer.  2004. Mating and pseudothecial development in Mycosphaerella citri, the cause of citrus greasy spot. Phytopathology 94: 978-982. PDF

Lahey, K. A., R. Yuan, J. K. Burns, P. P. Ueng, L. W. Timmer, and K.-R. Chung.  2004.  Induction of phytohormones and differential gene expression in citrus flowers infected by the fungus Colletotrichum acutatum.  Mol. Plant-Microbe Interact. 17: 1394-1401. PDF

Non-refereed Publications

Mondal, S. N. and L. W. Timmer.  2007.  Development of pseudothecia, ascospores, and epiphytic growth of Mycosphaerella citri, the cause of citrus greasy spot.  Proc. Int. Soc. Citriculture (accepted).

Timmer, L.W. and J.H. Graham. 2007. Fungal diseases that resemble graft-transmissible diseases.  Int. Organ. Citrus Virol.  Slide set. (accepted).

Timmer, L.W. and R.H. Brlansky.  2007. Citrus blight.  Int. Organ. Citrus Virol.  Slide set. (accepted).

Timmer, L.W. and C.A. Powell. 2007. Rio Grande gummosis.  Int. Organ. Citrus Virol.  Slide set. (accepted).

Mondal, S.N., K.T. Morgan, and L.W. Timmer. 2007. Effect of water management and soil application of nitrogen fertilizers, petroleum oils, and lime on inoculum production by Mycosphaerella citri, the cause of citrus greasy spot.  Proc. Florida State Hortic. Soc. 119: (submitted).

Albrigo, L. G., R. S. Buker, J. K. Burns, W. S. Castle, S. Futch,  C. W. McCoy, R. P. Muraro, M. E. Rogers, J. P. Syvertsen, L. W. Timmer, J. Attaway, K. Bowman, K. W. Hancock, M. A. Ritenour, P. D. Spyke, and R. C. Vachon.  2006.  The impact of four hurricanes in 2004 on the Florida citrus industry:  Lessons learned, what we know and don’t know.  Proc. Fla. State Hortic. Soc. 118: 66-74.

Timmer, L. W.  2006.  Efecto de la cancrosis y greening sobre la industria cítrica de Florida. Memorias del X Simposium Internacional de Citricultura.  Ciudad Victoria, Mexico.

Johnston, T. and L. W. Timmer.  2006.  Evaluation of products for control of citrus scab on Duncan grapefruit, 2005.  Fungicide and Nematicide Tests 61: VO70. DOI:10.1094/FN60.  The American Phytopathological Society, St. Paul, MN.

Johnston, T., T. Shilts, and L. W. Timmer.  2006.  Evaluation of products for control of melanose on Marsh grapefruit, 2005.  Fungicide and Nematicide Tests VO71. DOI:10.1094/FN60. The American Phytopathological Society, St. Paul, MN.

Johnston, T., T. Shilts, and L. W. Timmer.  2006.  Evaluation of products for control of melanose on Duncan grapefruit, 2005. Fungicide and Nematicide Tests Fungicide and Nematicide Tests VO69. DOI:10.1094/FN60. The American Phytopathological Society, St. Paul, MN.

Timmer, L. W.  2006.  Efecto de la cancrosis y greening sobre la industria cítrica de Florida. Memorias del X Simposium Internacional de Citricultura.  Ciudad Victoria, Mexico.

Timmer, L.  W.  2005.  Enfermedades sistémicas estranjeras a México.  Proc. IX Simp. Int. de Citricultura.  Ciudad Victoria, México.  Apr. 21-23.  7 pp.

Timmer, L. W.  2005.  Enfermedades de fruta y follaje estranjeras a México.  Proc. IX Simp. Int. de Citricultura.  Ciudad Victoria, México.  Apr. 21-23.  14 pp.

Johnston, T. and L. W. Timmer.  2005.  Evaluation of products for control of citrus scab on Marsh grapefruit, 2004.  Fungicide and Nematicide Tests Report 60: V026.M06.DOI.10.1094/FN60.  The American Phytopathological Society, St. Paul, MN.

Johnston, T. and L. W. Timmer.  2005.  Evaluation of fungicides for control of Alternaria brown spot on Nova tangelo, 2004.  Fungicide and Nematicide Tests 60: V027.M06.DOI.10.1094/FN60.  The American Phytopathological Society, St. Paul, MN.

Johnston, T. and L. W. Timmer.  2005.  Evaluation of fungicides for control of Alternaria brown spot on Minneola tangelo, 2004.  Fungicide and Nematicide Tests 60: V028.M06.DOI.10.1094/FN60.  The American Phytopathological Society, St. Paul, MN.

Johnston, T. and L. W. Timmer.  2005.  Evaluation of products for control of citrus greasy spot on Marsh grapefruit, 2003-04.  Fungicide and Nematicide Tests 60: V024.M06.DOI.10.1094/FN60.  The American Phytopathological Society, St. Paul, MN.

Johnston, T. and L. W. Timmer.  2005.  Evaluation of products for control of citrus greasy spot on red grapefruit, 2003-04.  Fungicide and Nematicide Tests 60: V025.M06.DOI.10.1094/FN60.  The American Phytopathological Society, St. Paul, MN.

Johnston, T. and L. W. Timmer.  2005.  Evaluation of products for control of melanose on Duncan grapefruit, 2003.  Fungicide and Nematicide Tests 60: V149.M06.DOI.10.1094/FN60.  The American Phytopathological Society, St. Paul, MN.

Johnston, T. and L. W. Timmer.  2005.  Evaluation of products for control of melanose on  grapefruit, 2004.  Fungicide and Nematicide Tests 60: V148.M06.DOI.10.1094/FN60.  The American Phytopathological Society, St. Paul, MN.

Timmer, L. W. and M. Orozco-Santos.  2005.  Manejo de antracnosis y mancha grasienta en cítricos.  III Simposio Internacional Cítricola, p. 103-113.  Tecomán, Colima, México.

Orozco-Santos, M., V. M. Medina-Urrutia, M. Robles-González, J. Orozco-Romero, O. Pérez-Zamora, J. J. Velásquez-Monreal, and L. W. Timmer.  2005.  Biología y manejo integrado de anthracnosis del limón mexicano en el trópico seco de México.  SAGRAPA, INIFAP, CIRPAC, Campo Experimental Tecomán.  Folleto Técnico Núm. 1. 70 pp.

Bhatia, A. and L. W. Timmer.  2004.  Evaluation of products for control of Alternaria brown spot on Murcott tangors, 2002.  Fungicide and Nematicide Tests.  Report 59: V031.M06.DOI.10.1094/FN59.  The American Phytopathological Society, St. Paul, MN.

Johnston, T. and L. W. Timmer.  2004.  Evaluation of products for control of citrus scab on Marsh grapefruit, 2003.  Fungicide and Nematicide Tests.  Report 59: V028.DOI.10.1094/FN59.  The American Phytopathological Society, St. Paul, MN.

Johnston, T. and L. W. Timmer.  2004.  Evaluation of products for control of melanose on grapefruit, 2002.  Fungicide and Nematicide Tests.  Report 59:  V026.DOI.10.1094/FN59.  The American Phytopathological Society, St. Paul, MN.

Johnston, T. and L. W. Timmer.  2004.  Evaluation of products for control of citrus greasy spot on Redblush grapefruit, 2002-03.  Fungicide and Nematicide Tests.  Report 59:  V030.DOI.10.1094/FN5.  The American Phytopathological Society, St. Paul, MN.

Johnston, T. and L. W. Timmer.  2004.  Evaluation of products for control of citrus greasy spot on red grapefruit, 2002-03.  Fungicide and Nematicide Tests.  Report 59:  V027.DOI.10.1094/FN59.  The American Phytopathological Society, St. Paul, MN.
 
Johnston, T. and L. W. Timmer.  2004.  Evaluation of products for control of citrus greasy spot on Marsh grapefruit, 2002-03.  Fungicide and Nematicide Tests.  Report 59: V029.DOI.10.1094/FN57.  The American Phytopathological Society, St. Paul, MN.
 
Johnston, T., L. Marais, and L. W. Timmer  2004.  Alternatives against Alternaria brown spot: controlling brown spot on Murcott tangors, p. 379-381.  In:  T. P. Lyons and K. A. Jacques.  Proc. 20th Annual Alltech Symp.  Nottingham Univ. Press, Nottingham, UK.

Timmer, L. W.  2004.  Enfermedades de los cítricos causadas por la Alternaria.  XXI Jornadas Agríicolas y Comerciales.  Huelva, Spain, p. 127-130.

Books and Reviews

Rogers, M.E. and L.W. Timmer, eds. 2007.  2007 Florida Citrus Pest Management Guide. Univ. Florida, Inst. Food & Agric. Sci., Publ. No. SP-43. 

Rogers, M. E. and L. W. Timmer (eds.).  2006.  2006 Florida Citrus Pest Management Guide.  Univ. Florida, Inst. Food & Agric. Sci., Publ. No. SP-43. 146 pp.

Mondal, S. N. and L. W. Timmer.  2006.  Greasy spot, a serious endemic problem for citrus production in the Caribbean Basin.  Plant Dis.90: 532-538.

Timmer, L. W.  2005.  2005 Florida Citrus Pest Management Guide.  Univ. Florida, IFAS, Publ. No. SP-43, 156 pp.

Peres, N. A., L. W. Timmer, J. E. Adaskaveg, and J. C. Correll.  2005.  Life styles of Colletotrichum acutatum.  Plant Dis. 89: 784-796.

Timmer, L. W.  2004.  2004 Florida Citrus Pest Management Guide.  Univ. Florida, IFAS, Publ. No. SP-43, 146 pp.

Timmer, L. W., S. N. Mondal, N.A.R. Peres, and A. Bhatia.  2004.  Fungal diseases of fruit and foliage of citrus trees, p. 191-227.  In:  Disease Management of Fruits and Vegetables.  K. G. Mujerki and S.A.M.H. Navqi (eds.).  Kluwer Academic.  The Netherlands.

Popular Articles

Rogers, M.E. and L.W. Timmer. 2007. 2007 Florida Citrus Pest Management Guide update.  Citrus Industry 88 (1): 11-12.

Timmer, L.W., J.H. Graham, and H.L. Chamberlain.  2007. Copper, copper, copper….the only effective product for canker control is also effective for many fungal diseases. Citrus Industry 88 (1): 8-10.

Timmer, L.W., N.A. Peres, and J. W. Hyun. 2007. New approaches for dealing with two more exotic diseases: citrus black spot and sweet orange scab.  Citrus Industry 88 (2): 20-22.

Rogers, M.E., S.H. Futch, H.L. Chamberlain, and L.W. Timmer. 2007. Control of insects, mites, and diseases of citrus trees in the urban landscape in Florida.  Univ. Florida, IFAS, EDIS.  Publ. No. ENY (in review).

Chung, K.R. and L.W. Timmer. 2006. Citrus diseases foreign to Florida: Phaeoramularia leaf and fruit spot. Univ. Florida, IFAS, EDIS.  Publ. No. PP-234.

Spann, T.M., M.E. Rogers, and L.W. Timmer. 2007. IFAS – Be cautious about guava Citrus Industry 88 (3): 18-19.

Timmer, L.W., H.L. Chamberlain, and M. Irey. 2007.  Inspection, survey, and diagnosis of citrus canker and greening. Citrus Industry 88 (4): 14-15,18.

Ritenour, M.A., L.W. Timmer, and H.L. Chamberlain. 2007. Producing and packing fresh citrus free of citrus canker.  Citrus Industry 88 (5): 15-18.

Timmer, L. W., J. H. Graham, and H. L. Chamberlain.  2006.  Fundamentals of citrus canker management.  Citrus Industry 87(6): 12-15.

Timmer, L. W., J. H. Graham, and H. L. Chamberlain.  2006.  Fundamentals of citrus canker management.  Univ. Florida, IFAS, EDIS. Publ. No. PP-231.

Timmer, L. W., R. F. Reis, S. N. Mondal, and N. A. Peres.  2005.  Managing Alternaria brown spot.  Citrus Industry 87(2): 16-17.

Futch, S. F. and L. W. Timmer.  2005.  Field identification of greasy spot disease.  Citrus Industry 86(1): 20-21.

Dou, H., J. Zhang, M. A. Ritenour, and L. W. Timmer.  2004.  Impacts of the 2004 hurricanes on postharvest handling of fresh citrus.  Packinghouse Newsletter 201: 1-4.

Chung, K. R. and L. W. Timmer.  2005.  Update of PFD controls in Florida.  Citrus Industry 86(2): 8-10.

Timmer, L. W.  2005.  Hurricane recovery:  citrus disease control programs.  Citrus Industry 86: 14.

Mondal, S. N. and L. W. Timmer.  2005.  Greasy spot rind blotch, a serious problem for production of fresh market grapefruit.  Citrus Industry 86(4): 35-36.

Roberts, P. D., H. L. Chamberlain, K.-R. Chung, T. S. Schubert, J. H. Graham, and L. W. Timmer.  2004.  Updated canker decontamination methods.  Citrus & Vegetable Magazine 69(4): 24-28.

Timmer, L. W., L. G. Albrigo, and N.A.R. Peres.  2004.  Weather, disease models, and fungicide applications.  Florida Grower 97(2): 32.

Timmer, L. W.  2004.  Greasy spot can be treated if identified early.  Florida Grower 97(7): 16, 18.

Graham, J. H. and L. W. Timmer.  2004.  Spotting brown rot.  Florida Grower 97 (8): 36.

Syvertsen, J., R. S. Buker, L. W. Timmer and P. Stansly.  2004.  Minimizing hurricane damage to citrus trees.  Citrus & Vegetable Magazine 69(1): 24, 28, 30, 34, 36.

Dou, H., J. Zhang, M. A. Ritenour, and L. W. Timmer.  2004.  Impacts of the 2004 Florida hurricanes on postharvest handling of fresh citrus.  Packinghouse Newsletter 201: 1-4.

Abstracts

Mondal, S.N., J.E. Stewart, T.L. Peever, and L.W. Timmer. 2007. Isolates of Alternaria alternata doubly pathogenic to rough lemon and tangerines. Phytopathology 97: (submitted).

Mondal, S.N., R.F. Reis, S.J. MacKenzie, and L.W. Timmer. 2007. Mating behavior of Colletotrichum gloeosporioides isolates from citrus.  Phytopathology 97: (submitted).

MacKenzie, S.J., L.W. Timmer, and N.A. Peres. 2007. Host range and population biology of Colletotrichum acutatum from fruit and ornamental crops. Phytopathology 97: (submitted).