Hymenoptera parasitóides em goiabeira no semiárido mineiro

Abstract

Identifying parasitoids that act in the population control of fruit tree pests of economic importance is one of the steps of great importance in determining tactics for managing populations of phytophagous insects, which reach the level of economic damage. This work was carried out with the objectives of knowing and characterizing the fauna composition of Hymenoptera parasitoids collected in commercial guava orchards in northern Minas Gerais, in addition to determining the natural parasitism index on the guava psilid, Triozoida limbata Enderlein, 1918. For this, about 20 terminal branches with four leaves fully open and with signs and/or presence of pests were collected and taken to the laboratory. The material was placed in 500 mL plastic containers and kept under controlled conditions until the parasitoids emerged. The obtained parasitoids were counted, fixed in 70% alcohol and subsequently identified. The data were subjected to fauna analysis and the percentage of parasitism on the guava psyllid was obtained. 8,156 specimens of Hymenoptera parasitoids were obtained, belonging to four superfamilies, nine families and 22 morphospecies. The Psyllaephagus and Aphelinus genres were classified as superdominant, superabundant, superfrequent and constant. Psyllaephagus trioziphagus (Howard, 1885) was the parasitoid associated with the guavapsyllid, being the most frequent genus during collections, with 4.88% of natural parasitism.