Arthropod Management Tests, 2016, 1–1
MANDARIN: Citrus reticulata Blanco, ‘Tango’ mandarin
doi: 10.1093/amt/tsw006 (D)
Insecticide Control of Cotton Aphid in Citrus, 2015 Elizabeth E. Grafton-Cardwell,1 Sara J. Scott, and Jamie N. Nemecek Department of Entomology, University of California, Riverside, CA 92521, Phone: (559) 592-2408, Fax: (559) 592-5947 (
[email protected];
[email protected];
[email protected]) and 1Corresponding author, e-mail:
[email protected] Subject Editor: David Haviland Satsuma (clementine, mandarin, tangerine) | Citrus reticulata
cyantraniliprole; flupyradifurone; petroleum oil; spirotetramat; thiamethoxam; tolfenpyrad Cotton aphid is a vector of citrus tristeza virus in citrus. A field trial was conducted in a 4-yr-old “Tango” mandarin block at the Lindcove Research and Extension Center, Exeter, California. Insecticides were applied to 10 trees per treatment using a 100 gal high pressure D30 diaphragm pump sprayer with mechanical agitation at 200 psi in 100 gpa of water. Foliar treatments were applied on 6 Mar 2015. Treatments were assigned to individual trees in an RCB design on 3 Mar based on pretreatment aphid counts and posttreatment sampling was conducted weekly for 3 wk. On all sampling dates, the number of aphid-infested terminals out of 25 terminals randomly selected from around the tree were counted. The
mean number of infested terminals were compared between treatments using ANOVA after log(x þ 1) transformation of the data and the means were separated according to the Fisher’s LSD test (P ¼ 0.05). All treatments significantly reduced the mean number of aphidinfested terminals compared with the untreated control for 2 wk post-treatment (Table 1). By 3 WAT, the aphid population had declined and the untreated control mean was not significantly different from the treatments. This research was supported by the California Citrus Research Board and industry gifts of funding and pesticides.
Table 1 Treatment/formulation
Rate-amt form/acre
Mean no. aphid-infested terminals 3 Mar (Pre)
Untreated Movento 240 SC þ Omni 6E oil Movento 240 SC þ Omni 6E oil Exirel 10 SE þ Omni 6E oil Exirel 10 SE þ Omni 6E oil Actara 25 WG þ Omni 6E oil Sivanto 200 SL þ Omni 6E oil Bexar 15 SC þ Omni 6E oil
4 fl oz þ 0.50% 10 fl oz þ 0.50% 5.25 fl oz þ 0.25% 10.5 fl oz þ 0.25% 5.5 oz þ 0.25% 10.5 fl oz þ 0.25% 27 fl oz þ 0.25%
4.7a 4.7a 4.5a 4.5a 4.5a 4.5a 4.5a 4.5a
13 Mar (1 WAT)
20 Mar (2 WAT)
26 Mar (3 WAT)
2.6a 0.2b 0.0b 0.0b 0.0b 0.0b 0.0b 0.0b
0.6a 0.1b 0.0b 0.0b 0.1b 0.1b 0.0b 0.0b
0.1a 0.0a 0.0a 0.0a 0.0a 0.0a 0.1a 0.0a
Means in each column followed by the same letter are not significantly different after log (x þ 1) transformation of the data (LSD, P > 0.05); nontransformed means are listed.
C The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America. V
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cotton aphid/melon aphid | Aphis gossypii
