"Tasted after Hualin Fangdi, color and Yangjing Shen Zhu, light and even wax wrapped in crisp, no more than the manna of the world." This is not only the praise of the Northern Song Dynasty poet Zhang Zhongshu for persimmon fruit, but also the psychological portrayal of persimmon fruit by contemporary consumers.
Luo Tian persimmon
Persimmon as a fruit tree native to China, the planting history has reached more than a thousand years, compared to Fuping County, Luotian County and other concentrated distribution areas, most of the persimmon planting mode is in front of the house and behind the house and other scattered planting, management factors caused by persimmon diseases and insect pests gradually highlighted. As an important pest that harms the young branches, leaves and fruits of plants, persimmon shell insects have gradually entered the field of view of fruit growers in recent years, and the harm caused by it is constantly forcing fruit growers to do a good job in the prevention and control of this pest. I would like to take this opportunity to talk to you about the control of persimmon shell insects.
1. Species analysis of persimmons
2. Control the key nodes of persimmon shell insect control
3. Explanation of production control measures for persimmons
Symptoms of persimmon shell insect harm to the fruit
<h1 class= "pgc-h-arrow-right" > species analysis of persimmons</h1>
Although there are many species of mesmer insects that harm fruit trees, for persimmon fruits, there are mainly two kinds of persimmon velvet beetle and long sponge bug.
Persimmon velvet beetle: also known as persimmon sponge borer, mainly endangers the fruit of the plant and young branches, young branches will form black spots or die, the leaves on it will also be deformed and fall off early; fruit victims will form yellow-green dots on the epidermis, and then as the disease worsens, the spot site begins to sink and turn black, and the young fruit will fall off in advance when it is damaged, causing the phenomenon of reduced orchard yield. The adult length of this pest is between 1.2-1.5 mm, the body color is purple-red, the body shape is oval, usually the female adult has a white wax shell on the back, and the male adult insect attaches white wax powder or wax filament to the surface. The nymphs of the persimmon pluriform are relatively short in length , about 0.5 mm , with short spine-like protrusions around the body.
Persimmon velvet beetle is a serious condition
Persimmon long silkworm: Adult insects and nymphs gather in the leaf buds, young branches, young leaves and fruit parts of persimmon trees, suck sap for harm, and then cause leaves and fruits to fall early, branches wither, tree weakness, and when harmful to branches and leaves, they will also excrete a large amount of dense dew, inducing the occurrence of persimmon soot disease, reducing leaf photosynthesis, and affecting the yield and quality of persimmon fruits in that year. The adults of the persimmon long silkworm are relatively long, concentrated in 2-3 mm, of which the female adults are wingless, the body color is brown, and the body shape is oval; the male adults have wings and have a wingspan of about 3.5 mm. The nymphs of persimmon long silkworms are also oval in size, but the color changes, it is pale yellow at the beginning of incubation, and then gradually becomes translucent brown.
The harm of persimmon long cottonworm to young branches
< h1 class= "pgc-h-arrow-right" > key node control of persimmon shell insect control</h1>
In order to accurately control the key time nodes of the control of persimmons, it is necessary to deeply understand the activity rules and life habits of these two kinds of mesopters, especially the time point of their initial incubation. Among them, persimmon venomous insects overwinter mainly in the form of juvenile nymphs in the thick skin gaps of the branches and dry stems, and then in the next year, persimmon trees begin to be active and harmful, generally occur 4 generations per year, each generation of nymph hatching peak is mainly in the first half of June, mid-July, mid-August and mid-to-late September; persimmon long sponge overwintering and persimmon velvet borer overwintering method is similar, are in the form of juvenile nymphs, when the spring budding season begins to be active, generally occurs 1 generation per year, but there are also some areas that occur 2 generations per year The peak incubation period of nymphs is mainly concentrated between late June and early July.
Persimmon shell worm is a serious harm to the fruit
< h1 class= "pgc-h-arrow-right" > explanation of the production control measures of persimmon worm</h1>
At present, most of the production of persimmon tree shell insect control is the use of chemical control methods, the advantages of this method is the pest annihilation, fast effect, good control effect, but the disadvantage is that too much use will affect the quality of the fruit, especially some of the orchards that have obtained organic green certification.
Predator - Jumping Wasp
The author suggests that when fruit growers control persimmon garden mesozoans, they should minimize the use of pesticides, specifically in the selection of pesticides, try to use non-toxic pesticides that meet green organic standards, such as spraying 5-7 baume degrees of stone sulfur mixture before the early spring germination of persimmon trees to carry out early spring garden clearance work, in order to kill overwintering larvae, reduce the insect source base, and then spray 10% imidacloprid wettable powder 2000 times liquid or 25% imidacloprid wettable powder during the peak of each generation of nymph hatching. Imidacloprid wettable powder 3000-4000 times liquid. In addition, chemical pesticide spraying should be carried out during the active period by staggering the natural enemies of the shell insects (predatory natural enemies: red dot lip ladybird, black edge red ladybird, etc.; parasitic natural enemies: jumping wasps, short-margined hairy wasps, etc.) to achieve the purpose of protecting natural enemies, reducing the number of pesticide sprays, and increasing the effect of biological control.
Persimmon fruit with complete loss of commodity value