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1 (D) ORANGE: Citrus sinensis (L.) Osbeck, Valencia ACARICIDAL CONTROL OF CITRUS RUST MITES, 2013 Philip A. Stansly University of Florida/ IFAS Southwest Florida Res. and Ed. Center 2686 State Road 29 North Immokalee, FL Phone: (239) Fax: (239) Barry C. Kostyk Citrus rust mite (CRM): Phyllocoptruta oleivora (Ashmead) Pink Citrus Rust Mite (PCRM): Aculops pelekassi (Keifer) The citrus rust mite (CRM) and the pink citrus rust mite (PCRM) are important citrus pests due to feeding damage resulting in the characteristic russeting that can reduce fruit yield and
2 quality. The trial was conducted at the University of Florida Southwest Florida Research and Education Center in Immokalee, Florida, on 17-yr-old Valencia orange trees planted at 15 X 22 ft spacing on double-row beds running north-south. An RCB design was used to assign 4 replications of each of the 9 treatments and an untreated check to 4 tree plots within a row with treated rows separated by an untreated buffer row. Applications to both sides of the tree were made 10 Jun using a Durand Wayland AF air blast speed sprayer operating at 1.9 mph and 300 psi with four nozzles (John Beane Ceramics 4,4,3,3) delivering 130 gpa. Ten fruit were sampled from centrally located trees in each plot. A 16 X Doublet hand lens was used to view an area of approximately 1.8 cm 2, referred to as the lens field, on two partially shaded areas of each sampled fruit. Total number of mites per 2 lens fields per fruit is reported. All data were subjected to ANOVA for treatment effects with means separated by LSD contingent of a significant F (P = 0.05) value. A pre-treatment sample on 6 Jun indicated there was a mixed population of the two rust mites and resulted in a combined average of 1.03 ± 2.41 (mean ± SD) mites per lens field. Post treatment evaluations were made at 3,10,17,23,31,38,46,51 and 65 days after treatment (DAT). Envidor, Agrimek oil and Agrimek + Induce significantly reduced the mite population through 51 DAT compared to the check, after which there were no significant treatment effects observed (Table 1). The two rates of Requiem reduced the population of mites consistently through 31 DAT except for the low rate at 10 DAT. The high rate of Grandevo + Cohere persisted through 38 DAT, one week longer than the low rate. A rate response was also seen with MBI Cohere which was however less consistent at either rate than Grandevo + Cohere.
3 Table 1 Rust mites/lens field Rate 10-Jun 13-Jun 20-Jun 27-Jun 3-Jul 11-Jul 18-Jul 26-Jul 31-Jul 14-Aug Product/Formulation amt/acre Applied 3 DAT 10 DAT 17 DAT 23 DAT 31 DAT 38 DAT 46 DAT 51 DAT 65 DAT Untreated 1.15a 1.20ab 4.05a 0.98a 1.35a 1.52ab 2.00a 3.53a 2.50ab Envidor 2 SC 18.0 oz x 0.21c 0.10c 0.03b 0.05c 0.03c 0.13e 0.24c 0.18c 1.44b Requiem 16 EC 0.5 gal x 0.38bc 1.93a 0.51b 0.36bc 0.26bc 1.00abcd 0.98abc 1.95ab 2.49ab Requiem 16 EC 1 gal x 0.48bc 0.17c 0.23b 0.38bc 0.33bc 0.74bcde 1.85ab 2.20ab 1.32b Agrimek SC oz x 0.10c 0.18c 0.13b 0.01c 0.05c 0.19de 0.10c 0.78bc 1.04b 435 Citrus Oil 2% x Agrimek SC oz x 0.25c 0.13c 0.06b 0.04c 0.13c 0.35de 0.48bc 0.70bc 1.75ab Induce 2% x Grandevo DF lbs x 0.85ab 0.58bc 1.46b 0.31bc 0.38bc 1.76a 1.83ab 0.58bc 3.08a Grandevo DF lbs x 0.51bc 0.41bc 0.18b 0.13c 0.20bc 0.50cde 2.10a 2.15ab 1.29b MBI 206 EP gal x 1.21a 0.41bc 1.81ab 0.79ab 0.38bc 0.99abcd 0.84abc 0.72bc 1.87ab
4 MBI 206 EP + 2 gal x 1.13a 0.41bc 0.71b 0.28c 0.72b 1.34abc 1.51abc 1.23bc 1.73ab Means within columns followed by same letter are not statistically different (LSD, P>0.05).
5 Part II: Materials Tested for Arthropod Management ORANGE: Citrus sinensis (L.) Osbeck, Valencia ACARICIDAL CONTROL OF RUST MITES ON CITRUS, 2013 Philip A. Stansly University of Florida/ IFAS Southwest Florida Res. and Ed. Center 2686 State Road 29 North Immokalee, FL Phone: (239) Brand Formulation Common name Composition Manufacturer Agri-mek 0.7 SC abamectin (Butyl)-7-((2,6-dideoxy-40-2,6- dideoxy3-0-methyl-x-larabinohexopyran osyl)-3-0- methyl-x-l-arabino- Syngenta Crop Protection P.O. Box Greensboro, NC hexopyranosyl)oxy)- 5 c6,6,7,10,11,14,15,17a,20,20a,2 0b-dodecanydro-20b-dihydroxy- 5 6,8,19-tetramethylsprio (11,16- methano-2h,13h,17h-furo (4,3,2- pg)(2,6) benzodioxacyclootadecin 435 oil 98.8%L Petroleum Oil Refined petroleum distillate Drexel Chemical Company P.O. Box Memphis, TN Requiem 16 EC Chenopodium Extract of Chenopodium ambrosioides near ambrosioides Bayer CropScience LP P.O. Box T.W. Alexander Drive Research Triangle Park,
6 North Carolina Grandevo DF Chromobacteriu m subtsugae STRAIN PRAA4-1T Chromobacterium subtsugae Marrone Bio Innovations 14 Baldtop Heights Danville PA MBI 206 Burkholderia. Burkholderia. spp Marrone Bio Innovations spp 14 Baldtop Heights Danville PA Envidor 2 SC spirodiclofen 3-(2,4-dichlorophenyl)-2-oxo-1- oxaspiro[4.5]dec-3-en-4-yl 2,2- dimethylbutanoate Bayer CropScience LP P.O. Box T.W. Alexander Drive Research Triangle Park, North Carolina 27709
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