Abraham, R., 2000.
Mite and thrips populations of soyabean varieties of different ripening groups. Növényvédelen, 36: 583-589.
Abstract
In studies in Hungary, establishment of mites in the early soyabean varieties took place one or two weeks before it occurred in the mid-, late-season ones. Highest population density was observed a week earlier, in the middle of August, and numbers of individuals exceeded the data recorded in late varieties. The situation was mainly attributed to low relative humidity and shortage of rainfall. As many as 99.4% of mites belonged to a single species, Tetranychus urticae Koch. The effect of predatory mites in reducing population density was insignificant. No considerable differences among the tested varieties were observed regarding the change in the number of thrips individuals. Peak of population density was basically determined, besides high relative humidity and rainy weather, by growth stage of soyabean, thus it occurred at flowering of the crop. Thrips tabaci Lindeman was the dominant species, constituting 91.1% of all thrips populations. The pest fed on the leaves already in the growth stages of soyabean. The other phytophagous species were the flower-dwelling Frankliniella intonsa Trybo, Thrips angusticeps Uzel, Anaphothrips obscurus Muller and certain Holothrips species. Predatory species composed 4.1% of thrips populations. Scolothrips longicornis Priesner preyed on spider mites, its occurrence being observed in late August
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