M. aenus is an important pest of oilseed rape particularly in Western Europe. The larvae are up to 3 mm long and white with brown sclerotised plates. Eggs are laid in the flower buds of the host-plant and the larvae develop within the flowers. Oviposition damage to the buds of oilseed rape can cause the flowers to drop off. Both adults and larvae feed on the pollen and nectar in the flowers. Resistance to pyrethroids has been reported in this…
INTRODUCAO A evolução da resistência de pragas a pesticidas tem sido um dos grandes entraves em programas de MIP em diversas culturas a nível mundial. Dentre as conseqüências da resistência estão a aplicação mais freqüente de produtos, uso de dosagens acima da recomendada no rótulo ou na bula do produto, uso indevido de mistura de produtos, e mudança de produto (geralmente para um produto mais caro e/ou mais tóxico) na tentativa de se obter um controle satisfatório de uma…
T. urticae is one of the most economically important pests in a wide range of outdoor and protected crops worldwide. T. urticae uses its mouthparts to penetrate plant cells, notably on the undersides of leaves, and ingests their contents. Each minute 1-2 dozen cells can be destroyed this way. The first visible symptoms are small whitish speckles, mainly around the midrib and larger veins. When these spots merge, the empty cells give areas of the leaf a whitish or silvery-transparent…
Worldwide there are approximately 4,500 species of cockroach (also referred to as “roaches”) of which about 30 are associated with human habitats. Of these 3 are well known pests – the German cockroach Blattella germanica is about 15 mm long when fully developed, and light brown in coloration, while the Oriental cockroach Blatta orientalis is shiny black and about 25 mm long. The largest of the three is the American cockroach, Periplaneta americana, which is dark brown and can be…
South-East Asian Thrips, Thrips parvispinus (Thysanoptera: Thripidae) Chilli (hot pepper) crop is mostly damaged by chilli thrips (Scirtothrips dorsalis Hood) and species such as Frankliniella occidentalis, Thrips tabaci and Frankliniella schultzii of which T. tabaci and F. schultzii are present worldwide in peppers predominantly. Adding to the list of damaging thrips is the tobacco thrips or invasive thrips or Southeast Asian thrips, Thrips parvispinus. One of the first reports of T. parvispinus was by Waterhouse (1993) from Indonesia, Thailand,…
(Download the information as a pdf file) What is insecticide resistance modelling and who uses it? One of the most common questions asked of insecticide resistance researchers is “How long will it take for insecticide resistance to occur?” One way to answer this questions is to look at past events and identify trends that may repeat. This can be informative, but limited to general trends. For example in the crop protection market, it is often predicted that a pest…
Overview: J IRAC is abbreviated name for Japan Insecticide Resistance Action Committee, and the Japanese translation is “殺虫剤抵抗性対策委員会 日本支部”. The Japan IRAC Group evolved from the local Diamide/Lepidoptera Working Group but has now formed a full IRAC Country Group by broadening their remit to include other pest species and chemistries as well as inviting membership from other companies. The first meeting of J IRAC in the Japan Crop Protection Association, a CropLife member in Japan, was held on the…