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CONTROL OF SILVERLEAF WHITEFLY ON POINSETTIA UNDER GREENHOUSE CONDITIONS, FALL 2001

CONTROL OF SILVERLEAF WHITEFLY ON POINSETTIA UNDER GREENHOUSE CONDITIONS, FALL 2001 (G55) POINSETTIA: Euphorbia pulcherrima (Wildenow) CONTROL OF SILVERLEAF WHITEFLY ON POINSETTIA UNDER GREENHOUSE CONDITIONS, FALL 2001 James A. Bethke and Richard A. Redak Department of Entomology University of California Riverside, CA 92521 Phone: (909) 787-4733 Email: bethke@citrus.ucr.edu Silverleaf whitefly (SLW): Bemisia argentifolii Bellows & Perring Poinsettias obtained as rooted cuttings were potted in 15-cm pots and allowed 12 wk growth (30-40 cm tall) before use. The plants were fertilized once with Apex Blue (14-14-14) and irrigated every day or as needed. On day (0), 10 whiteflies were caged on leaf no. 5 (counting from top leaf of about 1-cm area down). A circle was drawn around the cage (2.5 cm diam) to mark the spot of exposure. The whiteflies were removed 24 h later. After egg eclosion (8 d), the number of nymphs were recorded. Following treatment, the number of live nymphs were recorded on posttreatment weeks 1 and 2, and adult emergence was recorded on week 4. Treatments were applied using a backpack sprayer at approximately 30-40 psi. An RCB design was used with five single replicate blocks per treatment. Data were sqrt transformed to adjust for inequality of variances prior to ANOVA (SAS Institute 1999). LSD (a = 0.05) was used to separate means. Phytotoxicity was not observed in this trial. Forte caused 100% mortality 1 wk after treatment (Table). YRC-2894 allowed a few whiteflies to emerge as adults, but it had a significant impact on the number of emerging adults compared to the check. Novaluron (6, 9, and 12 ) and Distance, did not cause appreciable mortality to nymphs during the first weeks, but they did not allow any emerging adults. Mortality in these treatments occurred in the redeye stage, just prior to emergence. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF SILVERLEAF WHITEFLY ON POINSETTIA UNDER GREENHOUSE CONDITIONS, FALL 2001

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Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/27.1.G55
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Abstract

(G55) POINSETTIA: Euphorbia pulcherrima (Wildenow) CONTROL OF SILVERLEAF WHITEFLY ON POINSETTIA UNDER GREENHOUSE CONDITIONS, FALL 2001 James A. Bethke and Richard A. Redak Department of Entomology University of California Riverside, CA 92521 Phone: (909) 787-4733 Email: bethke@citrus.ucr.edu Silverleaf whitefly (SLW): Bemisia argentifolii Bellows & Perring Poinsettias obtained as rooted cuttings were potted in 15-cm pots and allowed 12 wk growth (30-40 cm tall) before use. The plants were fertilized once with Apex Blue (14-14-14) and irrigated every day or as needed. On day (0), 10 whiteflies were caged on leaf no. 5 (counting from top leaf of about 1-cm area down). A circle was drawn around the cage (2.5 cm diam) to mark the spot of exposure. The whiteflies were removed 24 h later. After egg eclosion (8 d), the number of nymphs were recorded. Following treatment, the number of live nymphs were recorded on posttreatment weeks 1 and 2, and adult emergence was recorded on week 4. Treatments were applied using a backpack sprayer at approximately 30-40 psi. An RCB design was used with five single replicate blocks per treatment. Data were sqrt transformed to adjust for inequality of variances prior to ANOVA (SAS Institute 1999). LSD (a = 0.05) was used to separate means. Phytotoxicity was not observed in this trial. Forte caused 100% mortality 1 wk after treatment (Table). YRC-2894 allowed a few whiteflies to emerge as adults, but it had a significant impact on the number of emerging adults compared to the check. Novaluron (6, 9, and 12 ) and Distance, did not cause appreciable mortality to nymphs during the first weeks, but they did not allow any emerging adults. Mortality in these treatments occurred in the redeye stage, just prior to emergence.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2002

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