Repelência de Ceratitis capitata (DIPTERA: TEPHRITIDAE) a biofertilizantes e extratos vegetais

Abstract

Ceratitis capitata is considered the key pest of fruit production worldwide, due to its wide host variety. As an alternative control method for this pest, the objective of this research was to evaluate the repellency of C. capitata to liquid biofertilizers added to plant extracts. The repellency was evaluated through olfactory arenas, using the biofertilizer Vairo and the plant enrichment, diluted in distilled water at 10% and added in equal parts with plant extracts of neem, pitanga and rue at concentrations of 30, 40 and 50% p/v. The larval infestation index was evaluated from the fruits used in the repellency bioassay. The addition of plant biofertilizer and neem extract at 30% w/v showed the highest repellency index for C. capitata, resulting in only 1.6% of visiting flies. The lowest rate of larval infestation was observed in the Vairo biofertilizer + rue extract and in the plant biofertilizer + neem at concentrations of 30 and 40% w/v, with averages of less than one larva/fruit. Vairo biofertilizer + neem extract and plant biofertilizer + pitanga reduces the number of adult insects in fruits and Vairo biofertilizer + rue extract and plant biofertilizer + neem reduces the number of C. capitata larvae in treated fruits. The addition of biofertilizers to the plant extracts analyzed influences the repellency and larval incidence of C. capitata when the fruits are treated with these mixtures.