What are the characteristics of black locust aphid? What is the method of prevention and control?
Robinia pseudoacacia aphid harms many kinds of legumes, such as Robinia pseudoacacia, locust tree, Amorpha fruticosa and so on. As an adult. The new shoots of Robinia pseudoacacia are clustered by nymphs to suck sap, which causes the new shoots to bend, the young leaves curl, the branches can not grow, and its secretions often cause coal fouling disease. The wingless aphid is about 2 mm long, oval, black and glossy, with obvious hexagonal reticulation on the back of the head, chest and abdominal segments 1-6; horizontal striations on the abdominal segments 7 and 8; winged aphids, long ovoid, black and smooth, wings gray-white, transparent.
Robinia pseudoacacia aphids occur for more than 20 generations a year. Wingless parthenogenetic aphids and nymphs overwinter at the junction of heart leaves and rhizomes of leeward and sunny places, wild alfalfa, wild peas and so on. The winged parthenogenetic aphids were produced on overwintering hosts in March next year, and migrated to leguminous plants such as spring peas and Robinia pseudoacacia, forming the first migration and diffusion peak at the end of May and the beginning of June. the population density of Robinia pseudoacacia increased gradually in early June, and the proliferation accelerated in the middle and late June, forming the third migration peak. In the rainy season and high temperature season in mid and late July, except for the peak of Robinia pseudoacacia and secondary migration in the shade, and the harm of continued reproduction of aphids on Amorpha, the population density decreased obviously. In October, it propagated on new buds such as lentils, kidney beans and Amorpha after harvest, and then gradually produced winged aphids and migrated to overwintering hosts to breed, harm and overwintering.
Prevention and control methods. During the period when aphids are harmful, 40% dimethoate EC or 25% parathion EC and 50% malathion EC 1000 × 200O can be sprayed; or 50% monocrotophos EC or 40% omethoate EC 5 × 10 times can be injected into the base of the tree trunk, or scrape off the old bark around the trunk and apply a ring 5cm wide with this depth.
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Hardwood cutting technique of Robinia pseudoacacia
1. Collection and storage of seed strips at the end of November, excellent clone seed strips of the same year were collected from the ear-picking nursery, or the stems of current-year seedlings used for cutting and afforestation were collected, the short spikes of 18-20cm were cut, and at least 2 buds were left per cuttage. The distance between the upper cut and the upper bud is 1. 0-1.5cm, and the lower cut is cut into a single Mallet shape. After 50 cuttings are cut, put them in a cool outdoor place and bury them with clean fine river sand (water content 60%). A layer of cuttings, covered with a layer of sand, try to make each stick see sand. The thickness of sand cover on each layer of cuttings is 3-5cm, but
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The occurrence regularity of locust aphids?
The occurrence regularity of Robinia pseudoacacia aphids: more than 20 generations a year, overwintering with wingless solitary aphids, nymph aphids or a small number of eggs in the roots, stems and leaves of leguminous plants such as wild alfalfa, propagating on overwintering hosts in March and April the following year, and producing winged parthenogenetic aphids that migrate to Robinia pseudoacacia, locust trees and other leguminous plants in late April. It is harmful all the year round, especially in the early flowering stage of Robinia pseudoacacia, and the winged aphid migrates to its host in October and overwinters. The optimum breeding temperature for aphids is 19 to 22 degrees Celsius, and the relative humidity is 65% to 70%, when the temperature is lower than
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