The productivity of bean crops is influenced by many factors, among them pests, in particular the leafhopper Empoasca kraemeri Ross & Moore (Hemiptera: Cicadellidae), and mainly the white fly Bemisia tabaci (Gennadius, 1889) (Hemiptera: Aleyrodidae) that damages the bean crop transmitting the golden mosaic virus. The aim of the present study was to evaluate the effect of bean cultivars, chemical fertilizer and insecticides on E. kraemeri and B. tabaci populations during the winter season. The genotypes IAPAR MD-806, IAPAR MD-808, and IAC-Carioca and Bolinha were analyzed. The number of nymphs and adults of leafhopper and white fly, percentage of leafhopper attack and number of plants with golden mosaic symptoms, from 7 to 56 days after plants emergency were evaluated. The number and weight of the strings per plant, the number of grains per plant and weight of grains (kg ha-1) were estimated at harvest. The damages caused by the incidence of leafhopper and the golden mosaic symptoms were less intense on the IAPAR MD-806 and IAPAR MD-808 than on Bolinha and IAC Carioca genotypes. The average number of adults of leafhopper was not affected by fertilization. Spraying of insecticides and application of fertilizer caused a lower number of adults of the white fly on the bean genotypes, when evaluated fifty-six days after plant emergency.
Insecta; white fly; leafhopper; bean