EFFICACY OF DISULFOTON FOR CONTROL OF THE GREEN PEACH APHID, MYZUS PERSICAE, ON PEPPERS

Abstract

In a 3-year study, one annual application of a 10% granular formulation of disulfoton in the soil at a rate of 2 lb actual toxicant per acre controlled M. persicae throughout the entire period that aphids were most prevalent in pepper fields. Some control was observed within a few days of treatment, but effective control did not occur until 2 to 3 weeks after placement of the insecticide. Irrigation increased the initial uptake of disulfoton, but after 2 weeks the degree of control was essentially the same in irrigated and nonirrigated plots.Analyses of fruit samples from treated plots showed that there were no detectable amounts of disulfoton or its oxidation products 42, 50, and 60 days after treatment. These observations suggest that the required interval of 90 days between treatment and harvest could be reduced. Appreciable amounts of the insecticide or its oxidation products were present in the leaves on all sampling dates.

ANNUAL FLIGHT PATTERNS OF THE GREEN PEACH APHID, MYZUS PERSICAE (HOMOPTERA: APHIDIDAE)

“…. Comparable data from Ridge Farm show similar peaks with generally lower catches in1969 and 1970 (Table I, B). years ( P = 0.05).…”

“…Foott et al (1969) reported a natural decrease in numbers of this aphid on peppers at Harrow at the end of August so that the decline in flights is probably associated with a population decline. Foott et al (1969) reported a natural decrease in numbers of this aphid on peppers at Harrow at the end of August so that the decline in flights is probably associated with a population decline.…”

“…The reason for the decline in flights at the end of August is not clear. Foott et al (1969) reported a natural decrease in numbers of this aphid on peppers at Harrow at the end of August so that the decline in flights is probably associated with a population decline.…”

Residue Reviews

“…Irrigation markedly increased the uptake of disulfoton from granules by cabbage (REYNOLDS and METCALF 1962) et al (1964) in carnations and by RIDcw A Y et al (1965 and in cotton, when deep placement of granules, however, was less effective with irrigation. FOOTT et al ( 1969) examined the control of aphids on peppers with disulfoton granules in the soil and analysed the residues in leaves and fruit, finding increased initial uptake of toxicant in irrigated plots. In England BURT et al (1965) concluded that some systemic insecticide granules in the soil were less effective in dry years than in wet years.…”