Persimmon pests and diseases, persimmon tree pest control

Sub-category: Tuesday, 19 June 2007.

Persimmon madness. The leaves of the diseased plant are large, but they are falling and brittle, the leaf surface is uneven, the vascular bundles of the leaf veins become black, and sometimes the black veins can be seen on the surface; The dorsal branches of the main side branches of the diseased tree are long, erect and clustered, and the top is weak and "chicken claw branch". Good control of leafhoppers and other vector insects can slow down the spread of diseases; Strengthen management and cultivate a strong tree; Trunks are drilled and perfused with penicillin.

Persimmon insects. The larvae mostly damage the fruit by boring into the young fruit from the base of the fruit pedicle. The victim fruit eventually turned into a "black persimmon".

Control methods: In June, according to the progress of the occurrence of pests, seize the incubation period of eggs, and choose 2000-2500 times of enemy killing or 20% rapid killing of 2000-2500 times liquid for prevention and control.

Scarab aeruginosa. Adults feed on leaves, which is more serious. The adult is 19-21 mm long, and the body and elytra are copper-green with a metallic luster.

The adult peak season is June. In addition, there are species such as four-striped scarab, which are harmful to sweet persimmon leaves and tender shoots. Prevention and control methods:

It takes advantage of its feigned death to hunt and kill in the early morning or evening. Spray the ground of the tree plate with dichlorine powder or 4% dipreme powder before vibrating. When the adult insect is harmful to the leaves, spray it with 2000 times the liquid killed by the enemy.

Spodoptera exigua. Adults are 20-22 mm long and have a wingspan of 40-44 mm. The head and thorax are gray, with black and brown spots, the antennae are brown, and the lower lip is grayish-yellow, obliquely extending forward and downward, resembling an olecranon.

Forewings greyish-brown with brown spots, anterior half brown within inner line, inner and outer line and hind half distinct, subterminal line black, middle outward. Hindwings yellow, with a black spot in the middle chamber, a black band on the outer margin, and two black stripes on the hind margin. The larvae have three color types: green, yellow and black, and the larvae are the pests of shoots and shoots.

It can be used to kill 2500-3000 times the enemy.

Scale insects. There are mainly persimmon cotton scales, paramecium scales, Japanese turtle wax scales, etc. According to the progress of the occurrence of pests, seize the incubation period of eggs, and choose two of the two alternating solutions of 40% chlorpat 1000 times, 25% chlorpat 1000 times, 35% Willik 1000 times or 35% scale lice 1000 times liquid for control.

1. Artificial control: in autumn and winter, combine digging the tree tray, applying base fertilizer, digging out the oocysts around the trunk, and burning them in a centralized manner. At the beginning of February, scrape off the old bark at the base of the trunk, apply sticky shellac about 10 cm wide, prevent the adults and nymphs of the tree, and use a brush every day to remove the adhered dead insects, and the effect is good.

Kilograms of gluctic glutine can be used in cotton oil, and after heating, put in kilograms of rosin powder, and then dissolve it and set aside. When the female lays eggs in the tree, she digs a pit around the base of the trunk and puts some leaves and weeds in it to lure the adult worm to lay eggs and then burn them.

2. Spray 3-5 Baumé stone sulfur mixture during the chemical control nymph stage, and the above agents can also be used for prevention and control.

Foliar top dressing, in the middle and late stages of persimmon tree fruiting, every 15 days or so, foliar spraying 800 times Gaomei organic humic acid active liquid fertilizer, 1500 times enhanced Yunda-120 mixture, or 500 times plant vitality, 2500 times Yiwei increase bacteria mixture, or magnesium sulfate, urea, potassium dihydrogen phosphate, 500 times Green Wind 95 mixture, spray 3 5 times in a row, evenly spray all branches and leaves and fruits, and it is advisable to start with water droplets.

Persimmon worm: During the peak period of insect occurrence, 2500-3000 times of 20% deltamethrin EC and 3000-5000 times of deltamethrin EC should be used for spraying and control. Blood-spotted leafhopper:

When a large number of nymphs appear, 50% octachic sulfate emulsifiable concentrate and 40% dimethoate emulsion 2000 times are sprayed for control. Persimmon powdery mildew: In mid-June, the back of the leaves was sprayed with 600 times of Xiansheng wettable powder, and the control effect was remarkable.

1. Persimmon worms

In winter, scrape off the old coarse skin on the branches, remove the remaining persimmon stalks, burn them intensively, eliminate the overwintering larvae, and remove the larvae in time from mid-August to early September to eliminate the pupae and larvae of the year. In the peak stage of adult incarnation, 2500-3000 times of 20% deltamethrin EC, 3000-5000 times of deltamethrin EC, 1500-2500 times of 20% chrysanthemum EC, 2500-3000 times of 20% fenvalerate EC, 1000 times of 50% thiophos EC and 20% thiophos EC can be sprayed twice, which can eliminate adults.

2. Blood-spotted leafhopper

When the first generation of nymphs will appear in large numbers after persimmon trees bloom in late May, 50% octaneous acid EC, 40% dimethoate emulsion 2000 times, and 50% pine borer EC 1000 times are sprayed for control. In addition, it is also necessary to clean up the weeds and fallen leaves under the trees in time to reduce the source of overwintering insects.

3. Persimmon spot disease

From June to July, spray 1:5:600 times Bordeaux solution for control, spray 2 times continuously, in addition, 70% mancozeb dry suspension 500 times liquid, 64% alum wettable powder 500 times liquid for prevention and control.

After the leaves fall and before the new leaves are extracted in the following year, the remaining diseased pedicles on the tree are completely removed to remove the source of the disease.

Fourth, persimmon anthrax

In mid-July and early August, spray 1:3:300 times Bordeaux solution or 70% mancozeb wettable powder 400-500 times, 50% benmonyl wettable powder 1500 times, and 70% thiophanate-methyl wettable powder 1000 times, and the control effect is obvious.

5. Persimmon powdery mildew

From late April to early May, spray stone flow mixture to kill germinated spores and prevent infection, and spray 600 times or 1 3-5 600 times Bordeaux liquid on the back of the leaves in mid-June to inhibit the spread of mycelium.

1. Integrated control of persimmon pedicle worm:

1. Spraying on the tree for control - 7-8 days after the initial flowering period of persimmon trees (the peak period of adult emergence) spray 25% chlorpyramide No. 3 2500 times; or 2,500 times the profit of extinguishing and sweeping; or more than 1000 times; or permethrin 2000-2500 times.

From mid-month to mid-July, the zombie fruits formed by the victims were manually removed and picked up and buried deeply.

From mid-month to early August, the treatment of the first generation of adult worms (peak emerging) is the same as above. The key part of the spraying is the fruit pedicle.

4. At the same time, the persimmon pedicle insect control was carried out on black jujube trees.

2. Comprehensive control of persimmon scales:

In the first half of the month, the persimmon scale is sprayed on the tree at the peak of the stinging period of 1500-2000 times of the lozenge or 800-1000 times of the speed scale gram and the line of gray butterflies, meticulous and thoughtful.

In the middle of the month, the first generation of eggs of persimmon scales hatched at the peak of 1500-2000 times of chlorchloride; Or 2000-2500 times of high-efficiency cyanide chloride, spraying key parts, branches, leaves, fruits, persimmon pedicles, and treating apple leaf curl moths, tea wing bugs, leafhoppers, etc.

3. Integrated control of persimmon caterpillars

At the end of April and the beginning of April, the trunk is sprayed with a ring; Spray the closed medicine ring in the main stem high rice, 15-20 cm wide, add 50 parts of water (or diesel) to one part of the medicine (pyrethroids), the density of the insect population is large, and spray the second time after 10 days.

In the middle and late months of the month, combined with the above-mentioned spraying to control persimmon caterpillars.

Symptoms of persimmon orchard spot and horn spot prevention and control: damage to leaves and fruit pedicles, yellow-green to light brown irregular lesions on the leaf surface at first, the color deepens after expansion, and then forms dark brown edges from inconspicuous to obvious. Persimmon pedicle infection mostly occurs around the pedicle, brown or dark brown, the edge is obvious or indistinct, expands from the tip of the pedicle inward, and the leaves and fruits fall when the disease is severe.

Prevention and control methods: garden spot disease, incubation period 60 to 90 days; The latent infection period of keratoplakia is in July and August, and the incubation period is 25-31 days. The occurrence of the two diseases causes the leaves to fall and the fruits to turn red, soften, and fall off early.

According to the law of pathogenic infection, generally at the end of May, June and the end of July, spray once each, focus on spraying the back of the leaf, you can choose 70% mancozeb warm powder 500 times: or 75% chlorothalonil wettable powder 1000 times: or 1:

5 6: 600 times lime multi-dose Bordeaux liquid: or 64% alum wettable powder 500 times:

or 50% promethein warm powder 1000 times; or 3% polyantimycin wettable powder 500 times, spray more than 1 3 times in a row, once every 10 15 days.

Summary. Hello dear, persimmon pepper pest control method: spray 800 times the solution of 40% dimethoate emulsion before planting, especially after planting seedlings, especially after June until early July, and then play several times l0% dimethoate emulsion 1000 times or 20% pyrethrin 8000-10000 times or 50% dichlorvos 1000 times.

Focus on scale insect control.

Hello dear, persimmon pepper pest control method: spray 800 times the solution of 40% dimethoate emulsion before planting, especially after planting seedlings, especially after June until early July, and then play several times l0% dimethoate emulsion 1000 times or 20% pyrethrin 8000-10000 times or 50% dichlorvos 1000 times.

Ask the teacher to talk about the time and medication for the control of adult tree scale insects.

Scale insect is a common pest in landscaping seedlings, and its host plants are very wide, whether it is trees, small flowering shrubs, vines, hedges, etc.

The living habits of each scale insect are different, so the date of control cannot be uniform, but it is important to remember that the best time to control scale insects is during the egg-laying and hatching period and the nymph stage.