Pear Thrips Emergence and Foliar Damage
Adult emergence of pear thrips, Taeniothrips inconsequens, from forest soil was monitored using 7.6-cm diam traps in 16 sites around Vermont from 1989–1991. Emergence usually started in mid-April, though in some sites began as early as 2 April or as late as 15 May. Pear thrips soil population levels in September, the number of thrips that emerged in spring, and the timing and rate of emergence were measured to determine if subsequent damage to foliage of sugar maple, Acer saccharum Marsh., was correlated with these factors. Thrips soil populations in September and the rate and timing of emergence were not consistently correlated with damage, whereas the number of thrips per emergence trap was positively correlated with damage in all study years. However, we observed annual fluctuations in the threshold number of thrips required for damage to occur.
KeywordsSugar Heptane Saccharum
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