Autumn is the harvest season, a large number of fruits have entered the ripening period, but it is also the most difficult pest on the fruit tree - the most serious period of harm to the shell insects, the control is not timely, often causing a large number of fruits to be killed before ripening, losing edible value and commodity value, resulting in serious yield reductions. How can we effectively control the shell worms on fruit trees?
Harmful symptoms
Mesosomes mainly attach to the leaves, branches, fruits and other parts of adult worms and nymphs, suck the sap of plants, and after the fruit is damaged, the fruit grows slowly, and yellow-brown spots appear on the surface of the fruit, so that the fruit loses its edible value and commodity value. Finally, the fruit falls off, resulting in a serious reduction in yield, after the leaf is damaged, yellow-brown spots appear on the leaves, the leaf color is yellow, and finally causes shedding, after the branch is killed, the growth of the fruit tree slows down, the growth of the fruit tree is weakened, and when it is severe, the branch dies.
Morphological characteristics
Mesophylla belongs to the same wing order, shield borer insects, currently found in China about 600 kinds, is the most diverse type of pest, the most harmful fruit trees are ash bug, Korean hairy bulbous bug, round shield bug, Mizuki jianworm, Kao's white shield borer, mulberry white shield bug. The adult surface of these pests is covered with a thick waxy mesembranous shell, hence the collective name of the insect shell. Adults and nymphs often cluster in fruits, branches, and leaf dorsals that suck plant sap with needles, and females have no wings and degenerate feet and antennae; males have a pair of soft wings with well-developed feet and antennae, and eggs are usually buried in wax filament blocks, under females, or under the female's secreted mesohus.
Regularity of occurrence
The algebraic occurrence of mesozoans varies greatly in different regions. Henan, Shandong, Anhui and other central provinces, 2 generations occur every year, with fertilized female adults overwintering on the branches and trunks, and in late April of the following year, when the greenhouse is suitable, the female adults begin to lay eggs, the eggs are laid under the shell, and the adults die after spawning. In early May, the nymphs began to hatch into nymphs, and after the nymphs crawled out, they crawled around looking for a host, usually fixed after 3 to 7 days, and stabbed the mouthparts under the bark to suck the sap, and no longer moved. At this time, the surface of the insect body has not yet formed a waxy layer, which is the first optimal period for the control of mesenchymal insects. Mesozoans have wax glands, which can also secrete a large amount of wax while sucking up the sap of the plant, covering the surface of the insect to form a mesolar. The second generation of nymphs in August to September, the nymphs become adults after about 40 days, is the second best control period, under suitable temperature conditions, continue to reproduce, when the temperature is low, the adults mate, fertilized females overwinter on the branches.
Prevention and control methods
From August to September, the mesozoan is in the nymph stage, the surface of the insect body has not yet formed a waxy layer, is the best period for the control of mesozoan, can be used 20% snail furazonamide suspension 2000 ~ 3000 times liquid uniform spray, because the snail furazone amine has an aspiratory conduction effect, the agent is absorbed by the leaf, can be carried out in both directions in the fruit tree, the adult insects and nymphs attached to the leaves, fruits and bark have a good control effect, the effective period is up to 43 days. It can greatly reduce the cardinality of overwintering mesozoans.
If you want to know more about practical agricultural technology, or have any questions, welcome to join the "Suiyang Agricultural Science Service Circle" for consultation
(Circle cards have been added here, please check out the today's headlines client)