How to control tree lice on fruit trees and cause no harvest?

Pear psyllids mainly harm by adults and nymphs sucking the leaves, petioles, young shoots and fruit juice of pear trees, and the damage is as good as that of peach heartworm. When pear psyllid nymphs feed on leaves, they secrete a mucus that sometimes sticks to the two leaves or the surface of the leaf and fruit, harming the leaf and fruit. The damaged buds die due to fungus parasitism, and the damaged leaf tissue is destroyed, turning into brown patches and sometimes falling leaves.

When there are nymphs in large numbers, most of the nymphs burrow into the curly leaves of the aphids, and when the damage is severe, the whole leaves turn brown, causing early defoliation. The yield and quality of the fruit have been greatly reduced, and the fruit growers have suffered serious losses.

<> before winter, it is best to clean up the dead branches in the orchard, which will reduce a lot of pests, and the weather will not come out to harm the fruit trees. The size of summer insects is relatively small, their body color is also very light, generally yellow or light green to reduce the number of overwintering insects, in late September in autumn and late September, wrap grass on the trunk, trap and kill overwintering adults, and irrigate the whole garden before the severe winter comes, which can greatly reduce the number of overwintering insects. The choice of spraying is to select all the stages that will kill the pest and disease, and it should contain a mucus decomposition effect.

The prevention and control of pear psyllids must be mastered in the hatching period of the eggs, and the annual sting is a good period for prevention and control.

In early spring and late autumn, the garden should be cleaned in time, the trunk should be coated with stone sulfur mixture, and the diseased old dead branches and warped bark should be pruned; At the same time of applying basal fertilizer, the soil should be deeply turned to clean up fallen leaves, pests and diseases, weeds and other things. If conditions permit, biological control of orchard irrigation in late autumn: the natural enemies of pear psyllids include pear psyllids jumping wasps, psyllids jumping bees, lacewings, ladybugs and small flower bugs, etc., which can help natural enemies eliminate pear psyllids.

If the control is not in time in the early stage, it can be controlled in the peak hatching period of the first generation of nymphs after flowering and the peak emerging of the first generation of adults 30 days after flowering. The early prevention and control is generally avermectin + imidacloprid, 2500 times liquid spray, and later use avermectin + acetamiprid.

Tree lice are a type of insect egg. Once found, the insecticide should be destroyed in a timely manner, once or twice a week, until the fruit falls, and the eggs should be harmful to both the tree and the fruit. This will lead to a decrease in productivity.

If the fruit contains these types of eggs, it will be difficult to control them. This will result in variegated fruits. In general, prevention is a top priority.

Tree lice on fruit trees can take various effective measures to eliminate, to prevent further spread or artificial control, it is best to spray control in the larval period, when the wax layer is not formed, the control effect is good.

On the one hand, it can be pesticide by hand. On the other hand, it can be used with medicine, plant hanging bottles and sprays combined, and at the same time supplement certain nutrients, such as potassium dihydrogen phosphate, amino acids, etc.

Before the winter begins, the orchard should be cleared of dead branches. In early spring and autumn, the trunk should be coated with stone sulfur mixture and pruned with dead branches. Clean up fallen leaves and debris, pests and diseases.

Usually you must spray pesticides in time, and after seeing these pests, you must kill them in time, and you must prune branches and leaves in time.

Prevention and control methods: There are mainly the following methods.

Strengthen plant quarantine: under natural conditions, scale insects are less active, their own transmission and diffusion ability is limited, and their distribution has certain limitations. However, with the development of production, the exchange and transportation of flowers are frequent, and the opportunities for artificial and long-distance transmission of pests and diseases are increasing.

The quarantine work stipulates that flowers can only be transported without dangerous pests and diseases (including various propagation materials). If pests and diseases are found, various effective measures should be taken to eliminate them to prevent further spread.

Manual control: In the process of cultivating flowers, if it is found that there are individual branches or leaves with scale insects, they can be gently brushed off with a soft brush, or combined with pruning, and cut off insect branches and leaves. It is required to be brushed, cut, and burned in a centralized manner, and do not litter.

Protection and utilization of natural enemies: such as the Australian ladybug, the big red ladybug, the parasitic shield scale, the golden aphid wasp, the soft scale aphid wasp, the red-spotted ladybird, etc., are all effective natural enemies, which can be used to control the harm of scale insects, and should be reasonably protected and utilized.

Tree lice (scale insects) on fruit trees can be treated in this way: about half a month before the spring germination of fruit trees (early to mid-March in Lunan area), the whole tree is sprayed with 3-5 Baumé stone sulfur mixture to control scale insects, and other pests and diseases can also be treated.

1. In winter and early spring, spray Baume 3 5 degree stone sulfur mixture or 3% 5% diesel emulsion to eliminate overwintering nymphs.

2. During the growth period, there are two key points to control: one is in early to mid-April, when the insect body begins to swell, spray Baumé stone sulfur mixture or 50% dichlorvos 1500 times. The second is from late May to early June, when the eggs hatch at the peak of the season, you can spray Baumé stone sulfur mixture or 40% dimethoate 1000 times, or 50% pine borer EC 1000 times.

You can cut it into pieces with a sweet taste and put it in a mineral water bottle, add a little white wine and aged vinegar and a small amount of water. Make a small opening in the appropriate position of the bottle, and then tie the bottle diagonally to the top of the branch, and this is it.

Pay attention to the proportions.

Spraying lice aphid net or witch net this medicine is designed to treat this sooner or later.

The body of the scale insect is encased in a carapace, and it is not effective if it is sprayed directly with drugs. It is like a blood-sucking lice, sucking the juice of the plant, thus causing great harm to the flowers and trees, the victim plant not only grows poorly, but also appears yellowing of the leaves, early defoliation and other phenomena, serious will make the plant wither and die. The affected flowers include Milan, jasmine, camellia, and smile.

The methods of prevention and control are:

Mix liquor with water in a ratio of 1:2. When treating insects, water the surface layer of the potting soil thoroughly. Scale insects begin to move at room temperature 7 in spring. It can be poured once in April, and then every half a month or so, and it is effective for 4 consecutive times.

Use 50 ml of vinegar (rice vinegar), soak a small cotton ball in vinegar, and gently rub it on the stems and leaves of the affected flowers and trees with a wet cotton ball to wipe off and kill the scale insects. This method is convenient and safe, which can not only achieve the purpose of insect control, but also make the damaged leaves green and shiny again.

Gently and repeatedly rubbing the diseased plants with sprinkler sperm can get rid of scale insects, and they can be removed very cleanly and thoroughly. If you wipe the orchid disease leaves with sprinkler semen, not only can the scale insects be removed, but also the larvae that are not clear to the naked eye, they are also completely killed, and the second year is rarely found to have scale insects as a pest, this method is simple, safe, and the effect is good.

Use diesel, washing powder, water according to the ratio of :6 to adjust the mother liquor, at this time the mother liquor contains 60%, milk-like, diluted with water 30% of the oil solution, the Milan, kumquat, cycad on the scale insects carefully sprayed. After one week, most of the scale insects changed from fresh orange to shriveled state, indicating that this method has a good control effect on scale insects.