Mitteilungen der deutschen Gesellschaft für allgemeine und angewandte Entomologie (2001) 13, 279-282

Christian Ulrichs, Inga Mewis, Wilfried H. Schnitzler and James R. Burleigh (2001)
Effektivität synthetischer Insektizide gegen Maruca vitrata F. sowie den Parasitoiden Bassus asper Chou and Sharkey in den Philippinen
[Effectivity of synthetic insecticides against Maruca vitrata F. and the parasitoid Bassus asper Chou and Sharkey in the Philippines]
Mitteilungen der deutschen Gesellschaft für allgemeine und angewandte Entomologie 13, 279-282
Abstract: The bean podborer, Maruca vitrata F. (Lep.: Pyralidae), is a serious pest of leguminous crops in the tropics and subtropics of Asia, Africa and Latin America. First insecticide resistances by M. vitrata were reported in Africa but not in Asia. Knowledge of insecticide resistances is important for the development of control strategies. Our attention was concentrated on the biological stages of this pyralid which are harmful in the field. Therefore, we tested in laboratory pod-dip bioassays the effect of the common synthetic insecticides chlorpyrifos, deltamethrin, methomyl, and carbaryl to M. vitrata larvae. Insecticides were tested in different concentrations, including the recommended one. Effects of the same insecticides were also tested with the parasitoid Bassus asper Chou and Sharkey (Hym.: Braconidae). Mortality was observed after 48 hours and the LC₅₀-values calculated using probit analysis. M. vitrata showed resistances to all four insecticides. Highest resistance was recorded for deltamethrin, followed by chlorpyrifos, methomyl and carbaryl. Fourth instar larvae were less sensitive to insecticides than 3^rd and 2^nd instars. None of the insecticides gave 100 % control at the recommended concentration. B. asper was very sensitive to insecticides tested and 100 % of the adults were killed at the concentration recommended for the host M. vitrata.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: German)
Database assignments for author(s): Christian Ulrichs

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest
health/environmental effects of pesticides
Research topic(s) for beneficials or antagonists:
resistance to pesticides

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Maruca vitrata	Cowpea and relatives (Vigna)	Philippines
Bassus asper (parasitoid)	Maruca vitrata	Cowpea and relatives (Vigna)	Philippines