Biological characteristics and control strategies of Exoplectria pseudoacacia
Robinia pseudoacacia Spodoptera litura. It is distributed in the Robinia pseudoacacia forest areas of Anyang, Puyang, Xinxiang and Kaifeng, Henan Province. It mainly harms Robinia pseudoacacia, and can harm jujube trees and crops in large occurrence years. The insect can eat light on the whole branches and leaves in a short time. In the year of high temperature and drought, the leaves can be eaten up 2 or 3 times a year, causing the upper part of the tree to die and sprouting from the middle and lower part of the trunk, causing serious harm to the growth of the tree.
Prevention and control methods:
(1) to build a mixed forest. The mixed forest of poplar and Robinia pseudoacacia in Anyang City has not been affected in recent years, but the others are all affected, so the construction of mixed forest is the fundamental way to control Robinia pseudoacacia.
(2) protect natural enemies and create a good ecological environment. Building a bird's nest, protecting and attracting natural enemies, and introducing insect viruses are all economical and effective control methods, which can achieve twice the result with half the effort:
(3) physical control. Artificial digging pupae, during the adult period, the use of black light or fire concentrated trapping and killing adults.
(4) controlling the source of insects. The occurrence of Robinia pseudoacacia has obvious insect source, which can be controlled by smoke agent and other methods in time.
(5) Chemical control. The ideal effect can be achieved by using diflubenzuron to control pests before 3 years old, and the ultra-low capacity 150k~lm2 can be used. The medicine has good adhesion. Resistant to Rain Water erosion, it has a good protective effect on natural enemy insects, affecting not only one generation, but also the next generation of larvae, pupae and adults, showing deformities and unable to reproduce normally.
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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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The occurrence regularity of Robinia pseudoacacia.
The occurrence regularity of Robinia pseudoacacia: 4 generations a year, overwintering as pupae in topsoil. Eclosion began in early April of the following year, mating and oviposition, the egg period was 15 days, the larval stage was about 25 days, the pupation began in early May, the pupal stage was about 10 days, and the adult life span was about 5 days. The second generation of adults appeared in the first and middle of July. The third generation of adults appeared in the middle and late August, and the last generation of larvae harmed to the middle of September. After maturing, they were pupated and overwintered. The eggs lay in the thick skin seams below 2 meters from the base of the trunk, accumulated into blocks and covered with gray hairs. Newly hatched
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