Answers are grounded in this paper and cite their sources.
A 3-year study was conducted in a replicated 30 variety strawberry planting to investigate the relationships between Lygus lineolaris (Palisot de Beauvois) feeding and strawberry yields. In 1977, an early warm season, 67% injured fruit resulted in a 30% reduction in mean berry weight. In 1978 and 1979, 36 and 31% injured fruit resulted in 14 and 11% reductions in mean berry weight, respectively. In 1978 and 1979, “typical” seasons, 1 nymph/blossom cluster resulted in 29% injury and ca. 9% reduction in mean berry weight compared to 45 and 20%, respectively, in 1977. Regressions are provided for influence of nymphs per flower cluster on percent injury and percent reduction in mean berry weight. An action threshold level is approximated at 1 nymph/25 blossom clusters.
No takes yet. Share an insight, caveat, or question.
G. A. Schaefers (1980) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: