Seasonal densities of tarnished plant bug (Heteroptera: Miridae) and other phytophagous heteroptera in brambles
1993
Spangler, S.M. | Agnello, A.M. | Schwartz, M.D.
Seasonal densities of the tarnished plant bug, Lygus lineolaris (Palisot), and other phytophagous Heteroptera on canes of blackberry and raspberry, Rubus spp., were examined at thirteen plantings during 1988-1990 in central New York. At least 27 species were found; L. lineolaris, Plagiognathus politus Uhler, and P. obscurus Uhler were most common. In some plantings, Adelphocoris lineolatus (Goeze), Lygocoris caryae (Knight), pentatomids, and Kleidocerys resedae (Panzer) were also common. In summer-bearing brambles, L. lineolaris and Plagiognathus spp. had two major periods of abundance: (1) nymphs and adults from the late bloom through the "green fruit" stages, and (2) adults during the fruit-ripening stage. The first situation was less common in commercially managed plantings. 'Heritage' raspberries had few insects present during the floricane (summer) crop and high adult L. lineolaris populations during the primocane (fall) crop as the fruit ripened. Adults of L. lineolaris and other Heteroptera were significantly more abundant on raspberry canes with ripe fruit than on canes having unripe fruit. The insect populations on adjacent flowering and fruiting broadleaf weeds could be contributing significantly to mirid densities on summer-bearing brambles before fruit ripens. The data indicate there are much larger nymphal heteropteran populations present on bramble canes than had been previously recorded, and that Heteroptera other than L. lineolaris, particularly Plagiognathus spp., are also abundant on bramble canes. Implications for bramble pest management are discussed.
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