Yellow passion fruit genotypes reaction to woodiness disease (Cowpea aphid-borne mosaic virus) in field conditions

摘要

Passion fruit woodiness disease (PWD) is the most important viral disease of yellow passion fruit {Passiflora edulis f.flavicarpa) and has caused serious damage to passion fruit growers. This disease causes decrease and deformation of the fruits and is associated with the occurrence of mosaic symptoms, accompanied by leaf malformation, blisters, a marked reduction in plant development, and woodiness in a variable percentage of fruits The present work had the objective of evaluating genotypes of yellow passion fruit, in terms of resistance to CABMV, under field conditions. The experiment was carried out in 2016 at Fazenda Agua Limpa (FAL), belonging to the University of Brasilia (UnB), located in Federal District, Brazil. The experimental design usedwas a randomized complete block, the plots were of four seasons and the subplots were composed of 32 genotypes, four replications and six data plants per plot. No pesticides were applied. Incidence and severity were measured monthly, during fruiting stage. In the 3rd evaluation period (May) the highest severity indexes were found for the evaluated genotypes. All genotypes were classified as moderately susceptible (MS). The severity was low at the different periods indicating a pronounced environmentaleffect.