Volume 47 Number 3 Article 2 Pages: 133-137
Year 1993 Month 7
Title: Tarnished Plant Bug Injury on Six Strawberry Cultivars Treated with Differing Numbers of Insecticide Sprays
Authors: D.T. Handley, J.F. Dill and J.E. Pollard
Citation
Abstract:
Six strawberry (Fragaria x annassa Duch.)
cultivars known to vary in susceptibility to
tarnished plant bug (Lygus lineolaris P. de B.)
injury (apical seediness) were grown for two
seasons under three insecticide regimes (three
sprays, one spray and no spray) to determine if
differences in susceptibility could be used to
modify chemical controls for this insect.
The
most susceptible cultivars harbored more
nymphs than the least susceptible cultivars.
Increased marketable yield as a result of insecticides was most pronounced on susceptible cultivars.
Differences in injury among cultivars were
greatest when no insecticide was applied.
'Honeoye' and 'Sparkle' had the least apical
seediness, followed by 'Redchief,' 'Guardian'
and 'Kent.' 'Mic Mac' consistently had the high
est level of injury.
When insecticide applications
were reduced, apical seediness did not increase
significantly for cultivars exhibiting low susceptibility.
Chemical name used: O, O-dimethylphosphorodithioate
of diethylmercaptosuccinate
(malathion).
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