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CITRICOLA SCALE INSECTICIDE EFFICACY TRIAL, 2001

CITRICOLA SCALE INSECTICIDE EFFICACY TRIAL, 2001 (D6) ORANGE: Citrus sinensis L., Osbeck, 'Washington navel' Elizabeth E. Grafton-Cardwell Department of Entomology University of California Riverside, CA 92521 Tel: (559) 646-6591 Fax: (559) 646-6593 bethgc@uckac.edu Chris A. Reagan Citricola scale (CS): Coccus pseudomagnoliarum (Kuwana) The efficacy against citricola scale of two neonicotinoid insecticides, imidacloprid (Admire, Provado) and acetamiprid (Assail) as well as a low rate of the organophosphate insecticide chlorpyrifos (Lorsban) were compared to a water treated check. Insecticides were tested using various rates, application timings and with or without oil as a surfactant. Ten twigs (approximately 30 cm in length ) per tree were randomly selected from the outside periphery of the canopy, approximately between 1.0 and 2.0 m from ground level. Treatments were assigned to eight single tree replicates based on pretreatment live adult female scale densities. Admire was applied in May 2001 as a soil drench in the area of the microjets in 175 ml of water per tree after 1 h of pre-irrigation. Application was followed with approximately 2 h of irrigation. Foliar sprays were applied in 300 gpa, at 300 psi with a Bean hand-sprayer. Treatments were applied to 18-yr-old 'Washington' navel orange trees at the Lindcove Research and Extension Center, Exeter, California. May treatments were applied when the population consisted primarily of adult females on twigs. Sep treatments were applied when the population consisted of young nymphs on leaves. Nov treatments were applied when the population was mixed young and maturing nymphs on both leaves and twigs. Effects of treatments on early instars of citricola were determined by recording the number of live nymphs per leaf from 10 leaves collected from the northeast quadrant of each tree. Long-term population reduction was determined by evaluating the density of adult female citricola on twigs the following spring (9 Apr 2002). In Jul, the May applications of Admire, Provado at 10 and 20 oz/acre, and Assail all significantly reduced the CS population compared with the water treated control, with the greatest effect due to 20 oz Provado or Assail (Table 1.). In Aug, the systemic Admire treatment showed increasing activity against CS. The Sep treatments of the neonicotinoids (Provado and Assail) were more effective than Lorsban treatments in reducing scale. The higher rate (20 oz) of Provado was the most efficacious treatment and did not seem to be significantly improve by the addition of oil. The light rate of oil (0.5%) provided very little reduction of CS on its own. All treatments, including the Nov application of Lorsban and Provado, were evaluated the following spring. Provado (20 oz) and Assail provided the greatest efficacy against CS without regard to what time of year they were applied. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CITRICOLA SCALE INSECTICIDE EFFICACY TRIAL, 2001

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Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/28.1.D6
Publisher site
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Abstract

(D6) ORANGE: Citrus sinensis L., Osbeck, 'Washington navel' Elizabeth E. Grafton-Cardwell Department of Entomology University of California Riverside, CA 92521 Tel: (559) 646-6591 Fax: (559) 646-6593 bethgc@uckac.edu Chris A. Reagan Citricola scale (CS): Coccus pseudomagnoliarum (Kuwana) The efficacy against citricola scale of two neonicotinoid insecticides, imidacloprid (Admire, Provado) and acetamiprid (Assail) as well as a low rate of the organophosphate insecticide chlorpyrifos (Lorsban) were compared to a water treated check. Insecticides were tested using various rates, application timings and with or without oil as a surfactant. Ten twigs (approximately 30 cm in length ) per tree were randomly selected from the outside periphery of the canopy, approximately between 1.0 and 2.0 m from ground level. Treatments were assigned to eight single tree replicates based on pretreatment live adult female scale densities. Admire was applied in May 2001 as a soil drench in the area of the microjets in 175 ml of water per tree after 1 h of pre-irrigation. Application was followed with approximately 2 h of irrigation. Foliar sprays were applied in 300 gpa, at 300 psi with a Bean hand-sprayer. Treatments were applied to 18-yr-old 'Washington' navel orange trees at the Lindcove Research and Extension Center, Exeter, California. May treatments were applied when the population consisted primarily of adult females on twigs. Sep treatments were applied when the population consisted of young nymphs on leaves. Nov treatments were applied when the population was mixed young and maturing nymphs on both leaves and twigs. Effects of treatments on early instars of citricola were determined by recording the number of live nymphs per leaf from 10 leaves collected from the northeast quadrant of each tree. Long-term population reduction was determined by evaluating the density of adult female citricola on twigs the following spring (9 Apr 2002). In Jul, the May applications of Admire, Provado at 10 and 20 oz/acre, and Assail all significantly reduced the CS population compared with the water treated control, with the greatest effect due to 20 oz Provado or Assail (Table 1.). In Aug, the systemic Admire treatment showed increasing activity against CS. The Sep treatments of the neonicotinoids (Provado and Assail) were more effective than Lorsban treatments in reducing scale. The higher rate (20 oz) of Provado was the most efficacious treatment and did not seem to be significantly improve by the addition of oil. The light rate of oil (0.5%) provided very little reduction of CS on its own. All treatments, including the Nov application of Lorsban and Provado, were evaluated the following spring. Provado (20 oz) and Assail provided the greatest efficacy against CS without regard to what time of year they were applied.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2003

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