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United States Department of Agriculture

Agricultural Research Service

Title: Insecticidal control of Asian citrus psyllid and Asian citrus leafminer on Hamlin oranges, 2003

Authors
item MCKENZIE, CINDY
item Brock, Greg - EVANS PROPERTIES,INC.
item Murphy, Brook - CAL-AGRI PRODUCTS

Submitted to: Arthropod Management Tests
Publication Type: Other
Publication Acceptance Date: January 2, 2004
Publication Date: October 1, 2004
Citation: McKenzie, C.L., Brock, G., Murphy, B.C. 2004. Insecticidal control of Asian citrus psyllid and Asian citrus leafminer on Hamlin oranges, 2003. Arthropod Management Tests 29:D8, 3 pp.

Interpretive Summary: The insecticide trial was initiated to determine the efficacy of various pesticide products for control of Asian citrus pysllid(ACP) and Asian citrus leafminer (CLM) under Florida field conditions. Danitol 2.4 EC applied as a foliar spray at 8 oz/acre continually provided excellent control of all lifestages of ACP with seasonal mean mortality ranging from 85 to 95% depending on the lifestage evaluated. Spray Oil EC-435 foliar applied at 2 gal/ac (13.3% v/v) also performed very well against ACP immature stages (seasonal mean mortality 73-91%)and was not significantly different from control provided by Danitol. The non-ionic surfactants (SA 2002 and Agri-50) significantly reduced numbers of ACP compared to the untreated check, but may require higher gpa than used by the Curtec® Prop ultra-low volume sprayer to be more effective. Orthene 75S applied as a second spray behind SA 2002 provided good control of ACP if evaluated alone. Admire performed as well as the non-ionic surfactants against ACP (seasonal mean mortality 43-65%). Admire 2F had lower total CLM compared to the other treatments, but this was probably due to less fresh flush(ovipositional sites)available and not a result of the treatment. None of the treatments evaluated were significantly different or provided control of CLM with seasonal mean mortality ranging from 12.7 to 20.6 %. No phytotoxic effect was noted for any of the treatments.

Technical Abstract: The insecticide trial was initiated to determine the efficacy of various pesticide products for control of Asian citrus pysllid (ACP) and Asian citrus leafminer (CLM) under Florida field conditions. The trial was conducted during the rainy season (cumulative rainfall = 15.6 inches) in a commercial block of 2-yr-old 'Hamlin' citrus on smooth flat Seville rootstock in Pineda sand (one-third) and Riviera fine sand (two-third) soil types. Treatments were assigned to single beds, 2 rows wide by 560 ft long, in a RCB design, replicated 4 times on 3-4 ft tall trees with 10 by 25 ft spacing. Foliar applications were made on 16 and 26 May using a Curtec® Prop ultra-low volume sprayer equipped with 4 cross-flow fans and rotary atomizers (2 per tree) operating at 40 psi and delivering 15 gpa. A single soil application was made on May 16 using a Dicky John Tractor equipped with a 2 ft boom and 2 800C 40-flowjet nozzles operating at 8 gal per min and 40 psi, spaced 12" apart and held 8 inches above soil line. The soil application was applied as a 24inch swath before and 12-inch swath after each tree to deliver 16 oz/tree or 18 gpa. Counts were made pretreat, 4 and 7 days after the first application and 4, 7, 11, 14, 21, and 28 days after the second application. Data taken included the number of ACP adults per tree visible in a 2-minute period and counts of ACP eggs, small and large ACP nymphs, and CLM larvae per 3" fresh flush terminal. Leaves infested with CLM larvae from the 3" fresh flush terminals were probed to determine if they were dead or alive. Danitol 2.4 EC applied as a foliar spray at 8 oz/acre continually provided excellent control of all lifestages of ACP with seasonal mean mortality ranging from 85 to 95% depending on the lifestage evaluated. Spray Oil EC-435 foliar applied at 2 gal/ac (13.3% v/v) also performed very well against ACP immature stages (seasonal mean mortality 73-91%) and was not significantly different from control provided by Danitol. The non-ionic surfactants (SA 2002 and Agri-50) significantly reduced numbers of ACP compared to the untreated check, but may require higher gpa than used by the Curtec® Prop ultra-low volume sprayer to be more effective. Orthene 75S applied as a second spray behind SA 2002 provided good control of ACP if evaluated alone. Admire performed as well as the non-ionic surfactants against ACP (seasonal mean mortality 43-65%). Admire 2F had lower total CLM compared to the other treatments, but this was probably due to less fresh flush (ovipositional sites) available and not a result of the treatment. None of the treatments evaluated were significantly different or provided control of CLM with seasonal mean mortality ranging from 12.7 to 20.6 %. No phytotoxic effect was noted for any of the treatments.

Last Modified: 9/29/2014
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