Evaluation of the efficacy of botanical extracts and pesticides against Podagrica decolorata (Coleoptera: Chrysomelidae) found on okra Abelmonchus esculentus
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Abstract
Podagrica decolorata (Coleoptera : Chrysomelidae) is a serious pest of okra Abelmonchus esculentus. It is responsible for a significant yield losses of okra. The efficacy of four ethanol plant extracts and pesticides on Podagrica decolorata adults were collected on okra cultivation in Man, Côte d’Ivoire. Repellency and toxicity effects of ethanolic extracts were compared to the pesticides by contact and ingestion. Pesticides and 50 g/l of each ethanolic plant extracts were tested on ten Podagrica decolorata adults, respectively. The ethanolic extracts of the plants (Hyptis suaveolens, Carica papaya, Calotropis procera and Tithonia diversifolia) and pesticides (BioElit® and K-OPTIMAL35EC®) exerted repellent effects and induced mortality on Podagrica decolorata adults by ingestion and by contact. The pesticides BioElit® and K-OPTIMAL35EC® were on repellency class III with a value of 48.33% and 55.00%, respectively. They are followed by Carica papaya and Hyptis suaveolens, which were on repellent class II, with a value of 35.00% and 38.33%, respectively. The ethanolic extracts of Calotropis procera and Tithonia diversifolia were on repellency class I with a value of 18.33% and 6.66%. Hyptis suaveolens leaves extract can be used as a pesticide against Podagrica decolorata. This botanic extracts are eco-friendly, the plant is locally available and it efficacy is similar to the pesticides used in the bioassay.
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