EFFECTS OF TOMATO RINGSPOT VIRUS ON DRUPELET SET OF RED RASPBERRY CULTIVARS

Abstract

Tomato ringspot virus (Tom RSV) had particularly adverse effects on drupelet set of the red raspberry (Rubus idaeus L.) cultivars Avon and Lloyd George. It affected Matsqui, Puyallup and Newburgh to a lesser extent. In Tom RSV-infected Newburgh, reduced drupelet set occurred only on those plants showing decline symptoms. With Avon and Lloyd George, reduced drupelet set appeared to involve reductions in male and female fertility. In Matsqui, Puyallup and Newburgh, male fertility as determined by pollen quality did not seem to be affected. Tom RSV did not affect drupelet set of Canby, Carnival, Glen Clova, Latham, Malling Jewel and Meeker.