How to prevent the insect pest of the extract How to control the insect pest of wolfberry?

Grapefruit belongs to the Rutaceae family, an evergreen tree fruit tree, which is thermophilic, moist and requires fertile soil. The pest management of pomelo and citrus are generally similar, with common scales, mites, and moths, so pay attention to prevention and control.

Common insects in pomelo include aphids, leaf miners, flower bud maggots, thrips, fruit flies, beetles, weevils, scale insects, red spiders, etc.

Aphids, leafminer moths are mainly harmful to tender shoots, Spring Festival spring shoots, autumn shoots (grapefruit summer shoots are few) germination should be sprayed in time to prevent and control, the common formula is a combination of pyrethroid drugs + neonicotinoids, such as chloroflutamiprid, thiamis perchlorofluorine, homochloropyramidoprid, etc., can also be combined by themselves. Butterflies and moths both belong to the Lepidoptera, and can be used to play a role in the same prevention.

Recommended medication, 26%Chlorfluacetamiprid 750 times, or 70% imidacloprid 5000-600 times + 5% pyridyl ether 800 times, or 25% thiamethoxam 2000-3000 times + deltamethrin 1500 times.

Spring is also a good period for scale insect control, if before the germination of spring shoots, 97% Xicui imported mineral oil 200 times + 45% chlorpyrifos 1500 times, serious occurrence of snail ethyl ester 2500 times + chlorpyrifos 1500 times.

2-4 months is the period of bud maggot control, flower bud maggot occurs 1 generation to 2 generations a year, the second generation can overwinter, pupate in March, harm flower buds, in the crown of 60 cm ground can be sprinkled with chlorpyrifos or phosphine granules, shallow tillage between February and March. Cyhalothrin can also be sprayed on the ground before the flower buds bloom.

Grapefruit thrips damage leaves, branches, flowers, young fruits and other parts, and are stinging and sucking pests of the order Tassels, with a peak period from March to May and a peak period from October to November. Thrips are difficult to control because of their small size, mixed diets, fast running, and high resistance. Severe resistance with pyrethroids and neonicotinoids.

It is recommended to prevent and treat 5% pyridyl ether 600-800 times.

Longhorn beetle, weevil, beetle belong to the order Coleopteran pests, chewing mouthparts, can be controlled with emamectin benzoate or cyhalothrin. It is recommended to use 12% emamectin salt, acefenapyr 2000 times spray or 22% thiamis perchlorofluoride 2000 times.

Fruit flies mainly harm the fruit, so that the fruit rots and falls, especially in the fruit ripening period, pay attention to prevention and control. It can be trapped with 20% ethermethrin 1000 times or bait (yellow plate or bait poisoning). Emamectin benzoate + deltamethrin + acetamiprid can also play a preventive role.

Mites, like citrus, are seriously harmed by spider mites, with peaks in April-May and September-October, focusing on prevention. In winter, you can use mineral oil + alkyne mite + tetramitezine to clear the garden, and do not use alkyne mite in the new shoots.

The temperature is between 15 degrees and 25 degrees, 5% avermectin 1500 + 30% acetazolonitrile 3000 times the temperature is more than 25 degrees, 5% avermectin 2000 times + 43% bifenazide 3000 times red spider reproduction is fast, high resistance, the use of drugs should be rotated frequently, can not often use one, the principle of killing red spider is to kill insects and eggs together, fast-acting + long-lasting together. The drugs with good eggicidal effect are ethoxazole, spirodifenolate, thiobenone, avermectin, bifenazide, etc., and fluridine and alkyne mites have an effect on adult eggs, but they are prone to drug damage.

1. Completely clear the garden.

After each harvest, it is necessary to clean thoroughly, cut off the branches with diseases and pests, cut off the branches that have aged and lignified, and the diseased fruits, insects and fallen leaves, thoroughly clean them and burn them intensively, or bury them deep underground. After the garden is cleared, the whole garden can be sprayed with stone sulfur mixture, which can effectively kill insect eggs, prevent insect eggs from remaining, and prepare for the growth of the next year.

2. Disease prevention and control.

1.Gummosis.

The lesions will gradually spread to the trunk of the tree, endangering the branches and trunk of the tree, affecting the overall growth. Therefore, it is necessary to prevent and treat it as soon as possible, scrape off the bark at the lesion, and the inside can be blue-yellow, cut out the crack longitudinally, up to the xylem, and use drugs such as rot to cure it.

2.Foot rot.

Foot rot causes the bark at the base of the trunk to gradually decay, resulting in yellowing of the leaves and dry branches, with the rainy season being the most prevalent period. Before the onset of the disease or in the early stage of the disease, it is necessary to spray the 800 times solution of rot on the trunk for prevention and control.

3. Pest control.

Grapefruit tree insect pests are common red spiders, rust spiders, butterflies, leaf miners, etc., the middle of each month from May to September is the nymph period of insect pests, you can spray 1000 times of water ammonia thion, pyridazinone 2000 times liquid and other pesticides to control. Proper pruning and ventilation can also reduce the occurrence of pest problems.

There are wolfberry fruit flies, wolfberry spiny skin gall mites, aphids, negative mudworms, etc.

1) Fruit fly is a pest of the family Drosophila Dioptera, which is one of the main pests of Lycium barbarum, which loses 22% to 50% of wolfberry seeds every year due to fruit flies, and reaches 80% in severe cases. Late June to early July is the peak season. The larvae feed on the pulp, and after the pulp is eaten, it is covered with insect feces, and the damaged fruit changes color, shrivels, and dries up when it is ripe, and cannot be used medicinally.

The mature larvae drill out at night near the fruit stalk, bounce into the soil, pupate at 3 8 cm under the soil, and occur 3 generations a year, overwintering in the soil with pupae, and emerge the next year.

Control methods: When the overwintering adults emerge (late April to early May), combined with the ploughing of wolfberry orchards, sprinkle 5% carbaryl powder 3 kg or 90% crystal trichlorfon 75 100 grams per mu (15 20 kg of fine soil mixed and mixed) under the canopy of wolfberry orchards and in the higher places around wolfberry orchards, and then raked shallowly and covered with topsoil; maggot fruit is removed and buried deep for treatment or burned; In autumn and winter, the garden is irrigated or turned over to kill the overwintering pupae in the soil.

2) Wolfberry negative mudworm is also known as goldenrod worm, meat and egg worm, is an important pest of medicinal plants such as wolfberry, belladonna, vesicular grass, etc., the adult lays eggs on the young leaves, and the egg masses are arranged in a herringbone shape. Adults and larvae bite the leaves, so that the leaves are incomplete and form notches or perforations, and in severe cases, only leaf veins are left. In 4 September can be harmed.

Control methods: spray 90% trichlorfon 800 1000 times or 40% dimethoate emulsion 1000 1500 times liquid spray in the juvenile stage, 1 time for 7 10 days, spray 2 3 times in a row; Do not intercrop with Solanaceae plants; Remove the fruits or branches of the insects and burn them intensively or bury them deeply.

3) Goji aphid Goji aphid sucks young shoots, leaves, and young juice, making the plant brown and wilting, causing the tree to weaken, growth stagnation, and early defoliation.

Control methods: strengthen cultivating and weeding, remove wild weeds from ridges and roadsides in autumn and winter to reduce aphid overwintering hosts; Spray with 40% dimethoate emulsion 1000 1500 times liquid for control.

4) Lycium barbarum spiny gall mite, also known as rust mite or rust tick, is also one of the four major pests of wolfberry, in order to damage wolfberry young fruits, fruit stalks, young stems and leaves, can produce purple-red nevus gall, so that the tissue is deformed. When the wolfberry orchard is infested, the insect body is densely covered with leaves to suck the juice, so that the epidermal cells of the affected leaves are necrotic, the leaves are thickened and brittle, the leaves become rust-colored, fall off in advance, and become bald branches, and the wolfberry orchard is a withered brown. It has a great impact on the yield and quality, and the yield is generally reduced by about 60%.

Generally, eggs are laid in early and mid-April, and June, July and September are the two peak periods for the pest.

Prevention and control methods: clear the garden in winter, and burn the dead branches and fallen leaves; Strengthen the management of wolfberry orchards, reasonably prune and shape, increase ventilation and light transmission, and reduce humidity; Reasonable fertilization, increase the application of farmhouse fertilizer, reasonable fertilizer ratio, enhance the mite tolerance of wolfberry plants; In the spring leaf development period and autumn shoot extraction stage, use 1000 times of 40% dimethoate emulsifiable concentrate, or 1500 2000 times of 5% Nisolan wettable emulsifiable concentrate, or 2000 3000 times of 73% gmite emulsifiable concentrate, or 45% 50% sulfur glue suspension spray 2 3 times, the above agents have good control effects.

Control measures for wolfberry insect pests:

Lycium aphids, wolfberry gall mites, wolfberry rust mites, and wolfberry psyllids were sprayed twice with 40% dimethoate 1500 2000 times liquid solution from late April to early May, and then controlled according to the insect situation; In mid-March, wolfberry fruit flies and wolfberry negative mudworms were combined with shallow tillage, ploughing the soil under the canopy to kill pupa, and at the same time, maggots were removed every 5 7 days during the fruit picking period, buried deeply, and sprayed with 1500 times of 40% dimethoate emulsion.

Effective methods of pest and disease control:

1. Strictly implement the quarantine system to prevent the entry of diseased seedlings and diseased scion and insects that spread the source of the disease;

2. Establish disease-free nurseries, select disease-free mother trees as propagation materials, and plant disease-free seedlings;

3. Strengthen the management of orchard soil, fertilizer and water, enhance tree potential, and improve disease resistance from the root;

4. To prevent and control disease-spreading insects, spray with 80% dichlorvos emulsifiable concentrate or 40% dimethoate and other organophosphorus pesticides during each tender shoot extraction period;

5. Detect diseased plants in time, dig them up and burn them.

Among them, it should be noted that the new shoots of orange trees should be sprayed to protect themselves, and the new shoots can start to spray when they are centimeters long, and spray again every 10 days or so, with avermectin EC 2500-4000 times, 20% good winter EC 2000-3000 times, 5% imidacloprid EC 2000-3000 times, etc., all kinds of drugs should be used alternately.