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Effects of Aerial Spray Volume, Coverage, and Sabadilla on Scirtothrips perseae (Thysanoptera: Thripidae)

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Abstract:

Helicopter applications using sabadilla (27–57 g [AI]/ha and 11.1–23.7 kg/ha sugar bait) in different volumes of water were made on avocado against Scirtothrips perseae Nakahara in Ventura County, CA. On small (2.8 m tall) trees, volumes of 374 and 795 liter/ha resulted in 3–18% and 19–43% spray coverage, respectively, on water-sensitive papers. On large (6.9–8.4 m tall) trees, these volumes resulted in only 1–3% and 6–11% coverage, respectively. On small trees, sabadilla in 374 liter/ha significantly reduced numbers of larvae 3 and 6 d after treatment (DAT). In contrast, on large trees, 374 liter/ha did not reduce larval numbers and was less effective than 561–1,964 liter/ha from 3–11 DAT. However, volumes of 1,543 and 1,964 liter/ha did not increase efficacy compared with 1,169 liter/ha. The results indicate that large trees require sabadilla in higher spray volumes for control of S. perseae, making applications on large trees more costly. The extra costs may not result in larval control beyond 11 d, making it especially critical to properly time applications on large trees.

Keywords: Scirtothrips perseae; avocado; helicopter application; sabadilla; spray volumes

Document Type: Research Article

DOI: http://dx.doi.org/10.1603/0022-0493-94.5.1085

Publication date: October 1, 2001

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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