2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The pear-umbrella green aphid is a very serious pest of various pear varieties. Moreover, the nature of the damage caused by this pest is markedly different from damage by other types of aphids. The leaves of fruit trees, attacked by pear-umbrella green aphids, stop growing and begin to fold along the central veins in halves. And if the lesions are especially strong, then they dry out rather quickly
Meet the pest
The pear-umbrella green aphid grows in size on the order of 2 - 2, 5 mm. It is painted in greenish-brown tones and is characterized by the absence of wax bloom inherent in many varieties of aphids. Amphigonous female pests are brownish in color, and their legs, tails and tubes with antennae are dirty yellow.
In early spring, gluttonous larvae begin to hatch from hibernating eggs, first sucking juices from the buds, and then moving onto the leaves of flower rosettes. Closer to mid-May, the development of the first generation of pests is completed, and winged individuals are formed that fly to umbrella plants. The duration of the development of these parasites is largely determined by the ambient temperature. For example, the period of transformation of harmful larvae into adult founders at a temperature of about 6.5 degrees takes about 36 days, and at a temperature of about 11, 9 degrees - already 17 days. Adult founders live for about sixteen days, having time to hatch during this period from fifty to one hundred and twenty larvae, which are subsequently transformed into winged migrants.
In general, the pear-umbrella green aphid is a migratory species. Flying in the summer from pear trees to herbaceous plants belonging to the umbrella family, it begins to actively reproduce, developing in several generations, and with the onset of autumn it returns back to the pear. Having laid elongated black eggs in the cracks found on the bark of pear trees, the harmful females immediately die.
At the end of the autumn migration, the aphid begins to suck the juice from the leaves, both from the upper sides of the leaf blades and from the lower ones. Affected leaves are easy to notice by the large orange spots that appear on them, in the center of which there is often a louse surrounded by a brood of harmful larvae.
As a rule, the larvae keep in small colonies, thereby contributing to the appearance of rusty spots in the places of their feeding on the leaves.
How to fight
It is quite possible to destroy the pear-umbrella green aphid by hand, since it does not form huge colonies. Most often, it is first pressed with fingers, and then washed off under a stream of water from a watering can or under a warm shower. Some gardeners wash off pests with cotton swabs or soft brushes, but this method takes much more time. In this case, it is recommended to add laundry soap to the water - for each liter of water it needs about 10-15 g.
Also, against the pear-umbrella green aphid, various herbal decoctions and infusions (from tansy flowers, wormwood, citrus peels, onion husks, yarrow, marigolds, etc.) can be used quite successfully.
It is allowed to use insecticides for treatments. The best for such treatments are Tanrek, Arrivo, Cypermethrin, Iskra, Fitoverm, Intavir, Decis and some others. When using them, it is necessary to act in strict accordance with the instructions. As a rule, pear plantings are treated with these means twice with an interval of a week and a half - this contributes to the destruction of all parasites that survived after the first treatment, as well as the elimination of newly appeared individuals.
For the control of the pear-umbrella green aphid, measures taken to control the gray apple aphid are also suitable.
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