Haplothrips tritici (Kurdjumov) (Bournier A. / ENSA Montpellier) Adults Still in ear of wheat.. Haplothrips tritici (Kurdjumov) (Coutin R. / OPIE) pupa Overwintering. The leaves of wheat are sucked by H. tritici adults, causing streaks. The ripening seeds of wheat are sucked by H. tritici nymphs, leaving brown spots caused by. PDF | The wheat thrips, Haplothrips tritici, is known from across eastern Europe and adjoining areas of Asia into western Europe and north.
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Pests Haplothrips tritici Kurd. Class Insecta, order Thysanoptera, suborder Tubulifera, family Phloethripidae, tribe Haplothripini, genus Haplothrips. This is haplofhrips oligophagous pest of small grains, primarily wheat. The body is elongated, thin and black-brown to black. Fore tibia yellow except for the base and edges, fore tarsus yellow.
Wings with additional cilia, transparent, blackened at base. Female length is 1. Thelytoky males occur rarely and do not participate much in reproduction is registered in haplothgips regions, while in the others arrhenotoky sex ratio near to 1: Egg is pale-orange, oblong-oval, 0. Mature larva is bright red, with two setae at the end of abdomen.
A single generation develops per year. Larvae over-winter underground and among haplotyrips. In spring they rise to the surface where they pass through a complicated metamorphosis pronymph, nymph I, nymph II, adult. Part of larvae metamorphosis occurs underground. Adult has immature ovaries and requires additional feeding. Female fecundity is estimated yaplothrips eggs.
Eggs develop over a period of days. First instar larva are greenish-yellow, becoming reddish after hours, and bright red after the first molt. The second molt occurs after wintering.
The species is widespread in steppe and forest-steppe regions, haplotrhips to the Euro-Siberian faunistic complex. The period of metamorphosis is strongly prolonged about one month. Adults appear at the beginning of ear formation of winter cereals, haplothrjps in May-June.
During development of hpalothrips thrip adults invade winter rye at first, then winter wheat. The most intensive flight coincides with the beginning of ear formation of spring wheat where the great bulk of adults concentrate. Flying adults migrate by way of air streams at heights of 1.
Most often they feed behind a sheath of penultimate leaf, sucking sap from the gentlest part of ear husk. Females lay their eggs in small groups containing eggs each or, less frequently, one at a time, on the interior sides of ear scales and ear shank. The egg-laying period lasts days. First larvae suck sap from ear scales and flower glumes, then from caryopsis. Larval peak density occurs trktici the milk development stage of seeds. During the stage of early dough development the larvae start to leave ears.
The main host plants are winter and spring wheat, rye, wheatgrass and some other gramineous plants; spring wheat is the most favorable for insect development. Dry and warm weather during ear emergence and flowering of wheat the period of egg-laying and the beginning of larva feeding promotes increased insect survival; prolonged air drought and cool rainy weather are both rtitici for insect development.
Hot dry weather at the end of summer may also be unfavorable for insect survival due to the promotion of fast grain ripening and corresponding shortening of the larva feeding period.
AgroAtlas – Pests – Haplothrips tritici Kurd. – Wheat Thrips
In spring the larvae passing through metamorphosis perish because of heat and lack of moisture. In autumn and spring many larvae die during rainy weather which tritico development of entomopathogenic fungi, namely Entomophora spp. Predatory thrips, Aelothrips spp.
When preparing to hibernate the trktici can penetrate into soil to a depth of cm or more to 90 cm. The insect causes strong damage to wheat, especially to summer wheat, whose development is related most closely to the insect life cycle. To a lesser degree the pest harms winter rye, barley, and other cereals. Both adults and hpalothrips are dangerous, but the latter are usually more noxious, invoking partial or complete white ear effect, drying of flag leaf, partial ear fertilization, and incomplete grain filling.
During the pest outbreaks the larva density on sowing can reach and more individuals per ear Tanskii, Unlike the Sunn Pest, the flour-baking quality of grain damaged by thrips does not decrease, however the sowing quality of seeds drops notably.
Control measures include the following: In Russian Fisechko R. Allocation of wheat thrips Haplothrips tritici Kurd. Zashchita rastenii ot vreditelei i boleznei v Zapadnoi Sibiri.
Bioecological features of wheat thrips in north Kulunda and Ob forest-steppe. In Russian Grivanov K.
Haplothrips (Haplothrips) tritici
In Russian Shurovenkov Yu. Wheat thrips in Transural region and its control. In Russian Sitchenko N. Thrips Thysanoptera as pests of cereals in conditions of Ukraine. In Russian Tanskii V. Wheat thrips in regions of developing virgin and long-fallow lands in North Kazakhstan.
Formation of thrips Thysanoptera fauna of wheat sowings on new lands of North Kazakhstan. trituci
In Russian Zhichkina L. Features of biology, ecology and harmfullness of wheat thrips, Haplothrips tritici Kurd. Thysanoptera in forest-steppe of middle Volga region.