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1 August 2002 Effect of Neem Seed Extract on Feeding, Growth, Survival, and Reproduction of Diaprepes abbreviatus (Coleoptera: Curculionidae)
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Abstract

A commercially available neem seed extract, Neemix 4.5, containing 4.5% azadirachtin (AZA), was assessed for biological activity against the root weevil Diaprepes abbreviatus (L.), an important exotic insect pest of Florida citrus. Laboratory bioassays against neonatal and 3-wk-old larvae fed sliced carrot treated with Neemix produced dose-dependent larval mortality and reduced fresh weights among survivors of treatments. The weight response was greater than the mortality response for both larval age groups. Neonates treated with 45 mg/liter AZA weighed 60% less than those in the control after 4 wk. Three-week-old larvae treated with 45 mg/liter AZA weighed 30% less than those in the control after 5 wk. When neonates were exposed to insect diet incorporated with Neemix, reductions in larval survival and weight were observed at concentrations as low as 4.8 mg/liter AZA after 6 wk. Larval growth was inhibited by >97% with 42.9 mg/liter AZA in the diet. A soil drench containing 30 mg/liter AZA reduced the survival and weight gain of neonates added to potted citrus and provided protection to the roots in a greenhouse experiment. A concentration of 90 mg/liter AZA was required to provide protection of citrus roots against 4-wk-old larvae. Reproductive effects were observed when adult weevils were fed foliage treated with Neemix. The numbers of larvae hatching per egg mass were reduced by 27% and 68% at 30 and 90 mg/liter AZA, respectively. These results suggest that Neemix should be further evaluated for use in integrated pest management (IPM) programs of citrus.

A. A. Weathersbee and Y. Q. Tang "Effect of Neem Seed Extract on Feeding, Growth, Survival, and Reproduction of Diaprepes abbreviatus (Coleoptera: Curculionidae)," Journal of Economic Entomology 95(4), 661-667, (1 August 2002). https://doi.org/10.1603/0022-0493-95.4.661
Received: 23 July 2001; Accepted: 1 February 2002; Published: 1 August 2002
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