The greenhouse thrips (Heliothrips haemorrhoidalis) – pest management
The greenhouse thrips, Heliothrips haemorrhoidalis is a species native to tropical America, from where it has spread all over the globe.
Description. The adult has a blackish-brown body, 1.2-1.5 mm long. The larva is brownish-yellow, 1 mm long.
Biology and ecology. The pest develops in natural conditions only in very hot areas and overwinters in the egg stage. With the help of the oviscape, the female lays eggs on the foliar limb. After an incubation period of 5-6 days, the larvae hatch, which feed by stinging the epidermis of the leaves.
Attacked plants and damages. The greenhouse thrips develop well in field conditions, in very hot areas, on different plants: citrus, avocado, mango, coffee, grapevine, apple trees, pear trees, tea crops, spinach, geranium, etc. In greenhouse conditions, it causes damage to a large number of plants: azaleas, ficuses, roses, carnations, chrysanthemums, etc. It attacks the leaves, shoots, and flowers, leading to the formation of white spots. The attack on the flowers leads to their deformation. In case of strong attacks, a total or partial necrosis of the organs can be observed, and the attacked plants remain small.
Control: The use of blue traps is recommended.
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In case of severe attacks, it is recommended to apply treatments with specific insecticides:
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