Species composition and its seasonal changes of the Thysanoptera fauna in the mulberry fields.
1990
Miyazaki M.
In the literature 10 species of thrips are recorded as inhabitants of the mulberry trees in Japan. In the course of the present surveys in the mulberry fields, 19 species of thrips have been identified, resulting a total of 24 species recorded as components of the thrips fauna of the mulberry trees. Field surveys revealed that among the leaf-feeders the most important components were Pseudodendrothrips mori (Niwa) and Mycterothrips glycines (Okamoto). Mulberry flowers harbored few thrips, though such anthophilous species as Microcephalothrips abdominalis (Crawford), Thrips coloratus Schmutz, Thrips flavus Schrank and Thrips hawaiiensis (Morgan) were detected. A predatory thrips, Scolothrips takahashii Priesner, was seen sporadically. A mycophagous thrips, Hoplothrips japonicus (Karny), was found on a mulberry tree killed by cerambycid beetles. Many of the other recorded species may be mere vagrants. Thrips samples from mulberry leaves consisted of 1-6 (mostly 2 or a single) species. P. mori was observed in all of the 53 samples examined. M. glycines was also common, observed in 35 out of 53 samples. Either of these 2 species represented the major part of the individual samples, P. mori being overwhelmingly dominant in its peak season. Periodical sampling revealed that thrips as a whole became most rampant from mid-August to mid-September, when 88-100% of the thrips population was occupied by P. mori. From early July to early August, however, this species occupied only 20-53% of the thrips population, sharing 82-85% in an average throughout the season. M. glycines showed its peak of emergence earlier than that of P. mori. It shared 47-80% of the thrips population from early July to early August when P. mori was not so rampant, and 12-18% in an average throughout the season.
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