Premium
Biology, Damage and Control of Rosy Rnstic Moth, Hydraecia micacea (Esp.), on Hops
Author(s) -
French N.,
Ludlam F. A. B.,
Wardlow L. R.
Publication year - 1973
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1973.tb01773.x
Subject(s) - methidathion , biology , fenitrothion , pupa , larva , horticulture , pest analysis , wettable powder , toxicology , pith , infestation , botany , agronomy , pesticide , chlorpyrifos
SUMMARY The biology and importance of rosy rustic moth as a pest of hops was studied during 1967–72 in Kent. First larvae were found inside hop bines between 19 April and 7 May and they normally tunnelled in the pith of bines until June; thereafter they attacked the subterranean crown and roots. Sometimes bine tunnelling did not occur before subterranean feeding. Pupae occurred in soil near damaged hills during July and August. The earliest pupa was found on 29 June 1967. Eggs collected in September and overwintered in a Stevenson screen hatched in early May in the subsequent year. Larval damage occurred more frequently in weedy gardens and was most severe on headlands. Some gardens were regularly damaged each year. Two DDT sprays applied on 6–7 May and 16–18 May gave good control of larvae. Generally, less effective control was obtained with fenitrothion, azinphos‐methyl and methidathion. On a headland where six per cent of bines were tunnelled, larvae were controlled with three DDT sprays and the yield of hops was increased 2·5 cwt/acre (314 kg/ha). Symptoms of Fusarium canker were found in a larger proportion of tunnelled bines than in undamaged bines.