Abstract
Effect of bean genotypes, insecticides, and natural products on the control of Bemisia tabaci (Gennadius) biotype B (Hemiptera: Aleyrodidae) and Caliothrips phaseoli (Hood) (Thysanoptera: Thripidae). The influence of bean genotypes associated with neem oil as insecticide was evaluated to control B. tabaci (Gennadius) biotype B and C. phaseoli (Hood) during the wet season sowing. The experimental design used was the randomized block arrangement in a 4x4x3 factorial scheme, represented by genotypes, neem oil and insecticides respectively, with three replications. The genotypes Carioca, IAC Harmonia, IAC Centauro and Pérola were used. The evaluations were done at 14 and 42 days after seedling emergence, by counting B. tabaci biotype B eggs and nymphs and C. phaseoli nymphs in the genotypes leaf. Conclusion: The B. tabaci biotype B eggs and nymphs number were smaller in IAC Centauro and higher in IAC Harmonia. The tested genotypes were similarly infested by C. phaseoli. IAC Centauro and IAC Harmonia genotypes associated with neem oil (highlighting the full dose – 1%) provided lower number of whitefly eggs and thrips nymphs. Neem oil at the full dose also reduced whitefly nymph number. In the tested genotypes the insecticide provided reduction in the number of whitefly eggs and nymphs as well in the thrips nymphs, with increase in the recommend dose.
Highlights
Brazil has important position in the world bean’s (Phaseolus vulgaris L.) production since it is considered the biggest consumer, being this plant the main vegetal-protein source
This study examined the interaction between bean genotypes with plant-extract used as insecticides and chemical insecticides to control B. tabaci biotype B and C. phaseoli during the wet season
B. tabaci biotype B among evaluated treatments, we observed significant differences among them at 14 and 28 days after emergence (DAE), with both periods presenting IAC Centauro less infested than IAC Harmonia
Summary
Brazil has important position in the world bean’s (Phaseolus vulgaris L.) production since it is considered the biggest consumer, being this plant the main vegetal-protein source. The bean is a traditional culture that is getting more and more space in the agribusiness. It is consumed practically in all Brazilian States, cultivated along the year and its production comes almost 100% from the national lands. Bean can suffer insect attack and other pests that affect production before and post harvest. The estimative of yield losses by pests attack is from 33 to 86% (YOKOYAMA, 1998)
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