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An aphid infestation can ruin a garden. Learn what causes aphids and how to identify, kill, and control them naturally for healthy plants with no aphid holes.
The aphids do not usually cause much damage to overall tree health, but dieback is occasionally seen on very heavily infested branches. If infestations are heavy, twigs may die, but damage to the tree is usually minor. The aphids can be blasted off with a jet of water or can be controlled with any insecticides labeled for aphids.
Aphids of the round morph cause the ants to farm them, as with many other aphids. The flat morph aphids are aggressive mimics with a "wolf in sheep's clothing" strategy: they have hydrocarbons in their cuticle that mimic those of the ants, and the ants carry them into the brood chamber of the ants' nest and raise them like ant larvae. Once ...
As well as the parasitoid, Alphelinus mali, these aphids are preyed on by the bug Anthocoris nemoralis, ladybirds, hoverfly larvae and lacewings. The presence of earwigs Forficula auricularia on the trees can reduce the levels of aphid infestation, so encouraging these insects by providing shelters may be another means of biological control. [1]
This may halt the infestation if you detect it early enough, says Khan. Blast insects off with the hose. “A high pressure spray can physically remove them from garden plants,” says Kahn.
The woolly apple aphid, Eriosoma lanigerum is a widespread pest of fruit trees, feeding principally on apple, but also, pears, hawthorn, ash, alders, elms and oaks. Gall making species include Melaphis rhois and Pemphigus spp. Further minor damage can be caused by the honeydew that woolly aphids
As a result of infestation by this aphid, leaves of sugar beet become swollen, roll, and cease developing. The roots grow poorly and the sugar content is reduced. In some other plants, the leaves do not become distorted, but growth is affected and flowers abort due to the action of the toxic saliva injected by the aphid to improve the flow of sap.
Mild attacks cause discolouring and death of shoots while severe infestations can kill the tree. The sooty mould on the honeydew slows tree growth by impairing photosynthesis. Treatment to kill the aphids needs to be undertaken at an early stage of the infestation before populations have built up.
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