Comparisons of Ecorational and Chemical Insecticides Against Crucifer Flea Beetle (Coleoptera: Chrysomelidae) on Canola

Abstract

Studies were done comparing the insecticides SpinTor (spinosad), BotaniGard (Beauveria bassiana), Neemix (azadirachtin), and Surround (kaolin, a clay) with conventional chemical insecticides Capture (bifenthrin) and Helix XTra (thiamethoxam), all applied at seven rates in a 7-d assay to assess their impact on adult crucifer flea beetle, Phyllotreta cruciferae (Goeze) (Coleoptera: Chrysomelidae). Lethal time (LT) required for 25, 50, and 75% mortality (LT25, LT50, and LT75) and relative potencies for the insecticide concentration groupings (0, 1X-1.5X, and 2X- 4X) were estimated for each treatment by using survival functions. P. cruciferae mortality increased in response to increasing concentrations, especially for Helix XTra, Capture and SpinTor. After 2 d of exposure in 2002, mortality ranged from 54 to 78% for Helix XTra, from 60 to 94% for Capture, and from 66 to 92% for SpinTor across concentrations. In 2003, flea beetle mortality ranged from 37 to 60%, from 29 to 63%, and from 23 to 52% on exposure to Helix XTra, Capture, and SpinTor, respectively, for 2 d. The LT50 and relative potencies of the insecticides were in the order of Helix XTra, Capture, and SpinTor > BotaniGard, Neemix, and Surround. In 2002, LT50 values were 1 and 2 d for Capture and SpinTor, 2 d for BotaniGard, and 3 d for Neemix and Surround. In 2003, LT50 values occurred between 2 and 4 d after exposure to Helix XTra, Capture, and SpinTor, with LT50 values of 5-7 d on exposure to BotaniGard, Neemix, and Surround. SpinTor seems to be a suitable ecorational insecticide in canola, Brassica napus L., for P. cruciferae management.

Sustainable Management Tactics for Control of <I>Phyllotreta cruciferae</I> (Coleoptera: Chrysomelidae) on Canola in Montana

“…Similar Þeld studies in India have found a 100% reduction of P. cruciferae by the seventh day after application (Boopath et al 2010), and neem extracts have been reported to be an effective treatment against P. cruciferae (Antwi et al 2007) and P. striolata (Hou et al 2003). Neem biopesticides may, therefore, be well suited for inclusion in IPM programs (Schmutterer 1990, Immaraju 1998, Reddy and Guerrero 2000.…”

“…However, there are few reports on testing the Þeld efÞcacy of these entomopathogens against P. cruciferae. Furthermore, biopesticides neem (azadirachtin; Antwi et al 2007, Boopath et al 2010) and fatty acids (M-Pede; Natwick et al 2009) have been reported to reduce feeding injuries of P. cruciferae.…”

Toxicity of δ‐phenothrin and resmethrin to non‐target insects

“…Insects that did not move when prodded with forceps were considered dead. Abbott's formula,16 as defined by Perry et al 17 and Antwi et al ,18 was used to correct for control mortality, in which insects were exposed to vials treated with acetone only. Control mortalities were less than 5%.…”

Assessing the potential of biopesticides to control the cabbage stem flea beetle Psylliodes chrysocephala

“…However, here only low mortality (<40%) was recorded in the laboratory and high leaf damage was recorded in the field, leading the authors to conclude that Botanigard ES is not effective against this species. 68,69 Despite this, the efficacy of combinations of B. bassiana GHA (Botanigard 22WP) and M. anisopliae F52 (Met52) has been tested against the crucifer flea beetle under field conditions in the USA. 62 Results from this study indicated reduced feeding damage and similar yields to canola crops where imidacloprid had been used when repeated applications of both Botanigard 22WP and Met52 were made.…”