Abstract
Abstract The trial was conducted in a nursery block of 1.5 year old ‘Rio Red’ grapefruit rooted to Swingle citrumelo, planted in single rows, 6 inches between trees. All treatments included 1.5% Sunspray 7E oil and were applied on 2 Nov. 1995 using a hand held boom fitted with 5 Albuz ceramic hollow cone nozzles (two on each side and one over top) supplied by a CO2 backpack sprayer operating at 40 psi, with a spray volume of 25 gpa. A RCB design was used with 4 replications and 11 treatments. Blocks were single rows and plots consisted of 30 trees each. Evaluations on 10 new leaf flushes per plot were taken at 3,7, 14 and 21 days after treatment (DAT) and included the number of mines on the five smallest leaves per flush starting with a one inch leaf, number of live larvae and pupae on the entire flush, and a foliage damage index (percent leaf surface damaged).
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