Fruit and Vegetables

Green apple aphid

Green apple aphids

The green apple aphid is an insect that belongs to the order of the Rincoti and in particular to the family of the Aphids. The insect is a parasite that is able to hit the apple tree, the pear tree and other types of plants belonging to the Rosaceae. This parasite has a maximum size of 3 millimeters and could be particularly stressful for affected plants. It is able to live on the shoots and on the lower pages of the leaves. This insect is able to winter on the branches in the egg stadium, in fact it would be possible to observe on the plants some agglomerated black eggs. In spring, in the months of April or May, females are born that are able to generate the new larvae that will infest the plant. The entire life of the insect occurs on the infested plant.

Damage by the green apple aphid

The source from which this insect feeds is the sap of the plant, which is sucked through the mouth apparatus. Subsequently to nutritional punctures, one could see a crumpling of the leaves that could lose vitality. The shoots that are affected by the infestation show development problems and show significant deformations in the structure. The main problem that could lead to the infestation by this insect would be the vast production of honeydew. In fact the burns and asphyxia that could be caused by the honeydew deposits on the plants could lead to the formation of fumaggini. The abundant deposit of honeydew could cause a weakening of the plant that would be attacked by fungal diseases that would cause a reduction in photosynthesis.

Damage caused by honeydew

The honeydew that accumulates on the leaves causes a closure of the stigmas, through which the plant operates the gaseous exchange, this is why the leaves could face asphyxia. The honeydew, being a sugary substance, is also a very favorable substrate for the proliferation of various fungi that could cause dangerous fungal infections. Honeydew is also useful as a nourishment for many insects. The droplets of honeydew on the leaves, exposed to the rays of the sun, could cause dangerous burns on the leaf pages. For this reason the elimination of honeydew should be an essential intervention to be able to adequately safeguard the plants. In addition to the interventions to eliminate the honeydew, it would be advisable to use all the appropriate techniques so that the infestation does not proceed.

Green apple aphid: Fight against green aphids

The fight against the green apple aphid to obtain visible and lasting results could be carried out using chemical treatments or by exploiting the natural antagonists of the insect. It could be contrasted by using coccinellid Coleoptera, chrysopid Neutoptera, cecimoid Diptera, Diptera syrphid, Hymenoptera with parasitic action such as Ephedrus and Aphidius, or mites belonging to the genus Allothrombium. Usually the treatments should be carried out in spring, both before and after flowering, the same period in which those against the gray aphid are performed. If the infestation is extended, an intervention should also be made during the summer season. Interventions with specific products should be carried out in the presence of extensive aphid colonies and with caution so as not to eliminate positive aphids for plants.