SUSCETIBILIDADE DE GENóTIPOS DE MACIEIRA A Anastrepha fraterculus (DIPTERA: TEPHRITIDAE) EM DIFERENTES CONDI??ES DE INFESTA??O

摘要

SANTOS, JANAíNA PEREIRA DOS; REDAELLI, LUíZA RODRIGUES; SANT'ANA, JOSUé ?and? HICKEL, EDUARDO RODRIGUES. SUSCEPTIBILITY OF APPLE TREE GENOTYPES TO Anastrepha fraterculus (DIPTERA: TEPHRITIDAE) IN DIFFERENT INFESTATION CONDITIONS. Rev. Bras. Frutic. [online]. 2015, vol.37, n.1, pp.90-95. ISSN 0100-2945.? http://dx.doi.org/10.1590/0100-2945-050/14. ABSTRACTThe study aimed to record damages of Anastrepha fraterculus(Diptera: Tephritidae), on two developmental stages of apple fruits genotypes M-11/00 and ‘Catarina’, submitted to three different infestation conditions in the field, during the 2011/2012 crop season. The experiment was carried out in an organic apple orchard management at Epagri Experimental Station in Ca?ador, SC, Brazil. The average number of fruit flies was weekly recorded with four McPhail traps. Unripe and ripe fruits of the selection M-11/00 and of the Catarina cultivar, were submitted to artificial, controlled and natural infestation conditions. In the beginning of fruiting, after the thinning, in each genotype, 500 fruits were randomly bagged with nontextured fabric (TNT) packing. Fruits submitted to the artificial infestation were involved, individually, in a cage containing two mated females of A. fraterculus that stay for three days for oviposition. In the controlled infestation, in the same day of placing the cages, protected fruits were unbagged to be exposed for three days. No bagged fruits were used to evaluate the natural infestation. In each developmental stage the values of physico-chemical attributes of fruits were recorded. During the crop season, the average number of A. fraterculus was 3.08 fruit flies/trap/week. The average number of larvae and pupae was greater in M-11/00 ripe fruits, in all of the infestation conditions. These numbers, in the Catarina cv., did not differ neither among infestation conditions, nor in developmental stages. Pupae of A. fraterculus were not observed in ‘Catarina’ fruits, in these cultivar was recorded a highest acidity and lowest relationship of soluble solids/acidity.