Host resistance enhances susceptibility of Callosobruchusmaculatus (Coleoptera: Chrysomelidae) to herbal extract ofEchinophora platyloba
2017
Seyed Mohammad TABADKANI, Baqiyatallah University of Medical Sciences, Tehran, Iran | Mehdi KHOOBDEL, Baqiyatallah University of Medical Sciences, Tehran, Iran | Hamid Reza TAVAKOLI, Baqiyatallah University of Medical Sciences, Tehran, Iran
It has been argued that resistant cultivars may enhance the susceptibility of insectpests to insecticides, and thus can reduce crop production costs by lowering the rateof insecticide application. Here we studied the susceptibility of the cowpea seedbeetle, Callosobruchus maculatus (Coleoptera: Chrysomelidae), reared on either asusceptible or resistant cultivar of the mung bean (Vigna radiate), to a herbal extracttaken from the prickly parsnip, Echinophora platyloba (Umbelliferae). Afterselection of a susceptible (Parto) and a resistant (Sahar) cultivar, the median lethalconcentration (LC50) of the herbal extract was determined as 24.41 and 20.28 μL/250 mL air against beetles reared on susceptible and resistant cultivars, respectively.Rearing on resistant cultivar had a significant effect on biological parameters of C.maculatus regardless of insecticide application. However, herbal extract showed asignificant interaction with host resistance in terms of oviposition rate and pre-adultdevelopment time. These results provide evidence that the resistant cultivar increasesthe susceptibility of C. maculatus to herbal extract. The use of plant resistance incombination with narrow-spectrum insecticides seems to be of both economic andenvironmental importance, as it can reduce the costs of crop production and lowerthe doses of insecticides required for satisfactory pest control.
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