Diversity and sex ratio of thrips (Thysanoptera species) in winter wheat in Lithuania

Abstract

A study on the variation of species diversity and sex ratio of thrips in winter wheat (Triticum aestivum L.) was conducted at the Lithuanian Institute of Agriculture (currently -Lithuanian Research Centre for Agriculture and Forestry). Assessments of thrips abundance were carried out from the beginning of tillering (growth stage (GS) 21) until complete maturity (Gs 89). Thirteen thrips species belonging to the three families were identified: 10 thrips species belonged to Thripidae, 2 to Phlaeothripidae and 1 to Aeolothripidae families. In terms of the feeding group, one species (Aeolothrips intermedius) belonged to zoophagous, the rest of the species were phytophagous. Frankliniella intonsa, F. tenuicornis, Haplothrips aculeatus and Limothrips denticornis were the earliest thrips species identified on winter wheat in spring. The dominating species were L. denticornis (41.3%), H. aculeatus (25.8%) and F. tenuicornis (20.5%). An average sex ratio of L. denticornis was 84.7%, and of H. aculeatus -68.2%, and of F. tenuicornis -71.1% and of F. intonsa -60.9%.

Thrips (Thysanoptera) associated with two genetically modified types of linseed (Linum usitatissimum L.)

“…T. angusticeps was the dominant species irrespective of the type of oil flax used. It prefers flax but feeds on many other crops, like sugar beet, onion, peas, narrow-leafed lupin, broad bean, winter wheat and winter rye [10,21,41,44,51,52,58]. T. tabaci, which was the second important phytophagous species on oil flax, is an important pest of onion, other onion relatives, and several crops in most parts of the world [15,25,31,34,39,[41][42][43].…”

“…In this combination, the sex ratio reached 92 %. Vasiliu-Oromulu [55] from mountainous meadows, Š matas [51], Š matas et al [ 52] from winter rye and winter wheat also identified mainly females of T. tabaci. In the Netherlands, the male/female ratio on leek was 1/26 [56].…”

“…T. angusticeps is a polyphagous, widespread and common species in Europe. It prefers flax but feeds on many crops, like sugar beet, onion, peas, narrow-leafed lupin, broad bean, winter wheat and winter rye [10,21,41,44,51,52,58]. T. angusticeps has two generations per year in Europe [8,59].…”

Improving the design elements of sprayers to improve technologies in the protection of black currant against pests

“…Essential negative factors that directly affect the harvest of agricultural crops are pests [2]. One of the most effective ways to combat harmful organisms is a chemical method, which consists in spraying the large-scale industrial plantings [3].…”

On collection of predatory thrips (Insecta: Thysanoptera) in wheat fields

“…Mirab-balou (2011) has also collected and identified various predatory species of Aeolothrips, Haplothrips and Scolothrips from most wheat and barley fields of different provinces of Iran. In Lithuania and Serbia, A. intermedius has been reported as the only predator species in winter wheat fields (Andjus 1998;Šmatas et al 2013). The species has been introduced as one of the most abundant species in the wheat and barley fields of Serbia.…”