procession to feed in the canopy of the trees. If the leaves on a tree become scarce, the larvae move away from the tree collectively to colonise…
through young, wingless nymphs which crawl or are blown by the wind from tree to tree. Sometimes a few winged aphids are produced in summer. Winged…
caterpillars In the Municipality of Venray a third of the tree stock in the area, some 11,000 trees, is oak. ‘We’ve been using Koppert’s nematode…
Buxus are evergreen and slow-growing shrubs and small trees. They can grow up to 2–12 meters. The tree’s leaves are usually small (some 1.5-5 cm long…
Quercus spp. Oak About There are about 600 species of oak trees and shrubs in the genus Quercus of the beech family, Fagaceae. They occur mainly in…
affect the growth of mature trees. At sites where dead leaves containing overwintering pupae are not removed in the autumn, trees are usually totally…
on infested trees are clearly visible. Defoliation damage is extremely serious in young reforested areas where it may lead to death of trees, directly…
large colonies may be present on the trees. Winged aphids are produced in June or July. They move to plantain trees ( Plantago spp. ), the summer…
caterpillar . The municipality’s built-up area has a total of 22,000 oak trees. In the past, the municipality only extracted the nests. But as Petra…
Entonem nematodes managing oak processionary caterpillar There are many oak trees in the forests and plantations around Doetinchem. Marc van Rijswijk…
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