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Elizabeth E Grafton-Cardwell, Stephanie Doria, Insecticidal Control of Cotton Aphid in Citrus, 2018, Arthropod Management Tests, Volume 44, Issue 1, 2019, tsz025, https://doi.org/10.1093/amt/tsz025
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A field trial was conducted in a 4-yr-old ‘Tango’ mandarin block at the Lindcove Research and Extension Center, Exeter, California. Treatments were assigned to 10 individual trees per treatment in an RCB design on 14 Mar 2018 based on pretreatment aphid counts and sampling was conducted for 3 wk. Insecticides were applied in 100 gpa at 250 psi on 26 Mar 2018 using a 100-gal high-pressure D30 diaphragm pump sprayer with mechanical agitation with a D6 nozzle on a hand wand. All treatments were applied with 0.25% Omni 6E oil. On all sampling dates, the number of aphid-infested terminals out of 25 terminals randomly selected from around the tree were counted. The mean numbers of infested terminals were compared between treatments using ANOVA and the means were separated according to Fisher’s LSD (P = 0.05) after log(x+1) transformation of the data.
| Treatment/formulation . | Rate-amt form/acre or v:v . | Mean no. aphid-infested terminals . | . | . | . |
|---|---|---|---|---|---|
| . | . | 14 Mar . | 2 Apr . | 9 Apr . | 16 Apr . |
| Untreated control | 3.0a | 3.0a | 0.6a | 0.1a | |
| Assail 30 SG + Omni 6E oil | 3.5 oz + 0.25% | 2.9a | 0.0b | 0.0b | 0.0a |
| Beleaf 50 SG + Omni 6E oil | 2.8 oz + 0.25% | 2.7a | 0.0b | 0.1b | 0.0a |
| Minecto Pro SC + Omni 6E oil | 8 fl oz + 0.25% | 2.8a | 0.1b | 0.0b | 0.3a |
| Treatment/formulation . | Rate-amt form/acre or v:v . | Mean no. aphid-infested terminals . | . | . | . |
|---|---|---|---|---|---|
| . | . | 14 Mar . | 2 Apr . | 9 Apr . | 16 Apr . |
| Untreated control | 3.0a | 3.0a | 0.6a | 0.1a | |
| Assail 30 SG + Omni 6E oil | 3.5 oz + 0.25% | 2.9a | 0.0b | 0.0b | 0.0a |
| Beleaf 50 SG + Omni 6E oil | 2.8 oz + 0.25% | 2.7a | 0.0b | 0.1b | 0.0a |
| Minecto Pro SC + Omni 6E oil | 8 fl oz + 0.25% | 2.8a | 0.1b | 0.0b | 0.3a |
Means within a column followed by the same letter are not significantly different after log (x+1) transformation of the data (LSD, P > 0.05). Untransformed means are listed.
| Treatment/formulation . | Rate-amt form/acre or v:v . | Mean no. aphid-infested terminals . | . | . | . |
|---|---|---|---|---|---|
| . | . | 14 Mar . | 2 Apr . | 9 Apr . | 16 Apr . |
| Untreated control | 3.0a | 3.0a | 0.6a | 0.1a | |
| Assail 30 SG + Omni 6E oil | 3.5 oz + 0.25% | 2.9a | 0.0b | 0.0b | 0.0a |
| Beleaf 50 SG + Omni 6E oil | 2.8 oz + 0.25% | 2.7a | 0.0b | 0.1b | 0.0a |
| Minecto Pro SC + Omni 6E oil | 8 fl oz + 0.25% | 2.8a | 0.1b | 0.0b | 0.3a |
| Treatment/formulation . | Rate-amt form/acre or v:v . | Mean no. aphid-infested terminals . | . | . | . |
|---|---|---|---|---|---|
| . | . | 14 Mar . | 2 Apr . | 9 Apr . | 16 Apr . |
| Untreated control | 3.0a | 3.0a | 0.6a | 0.1a | |
| Assail 30 SG + Omni 6E oil | 3.5 oz + 0.25% | 2.9a | 0.0b | 0.0b | 0.0a |
| Beleaf 50 SG + Omni 6E oil | 2.8 oz + 0.25% | 2.7a | 0.0b | 0.1b | 0.0a |
| Minecto Pro SC + Omni 6E oil | 8 fl oz + 0.25% | 2.8a | 0.1b | 0.0b | 0.3a |
Means within a column followed by the same letter are not significantly different after log (x+1) transformation of the data (LSD, P > 0.05). Untransformed means are listed.
All treatments significantly reduced the percentage of aphid-infested terminals in the two post-treatment samples, after which time the population in the control declined to low levels (Table 1).
This research was supported by the California Citrus Research Board and industry gifts of pesticides and funding.
