There are many kinds of cherry pests and diseases, and the common pests and diseases are described as follows:
Perforating brown spot occurs from May to June, the leaves appear purple-brown dots, and then gradually expand into a round shape. The lesion site becomes dry and shrinks, becomes small holes, and the pathogenic bacteria mostly overwinter on diseased leaves, and is most suitable for development. The temperature is 25 °C to 28 °C, spread by the wind, in the rainy season is conducive to the incidence of infestation, tree weakness, poor drainage, poor ventilation and light transmission, the disease is serious.
Control methods:
(1) Strengthen the cultivation and management, rational pruning, and take care to cut off the diseased shoots, remove the diseased leaves in time and burn them, so as to create a clean growth condition for the plants.
(2) Before the new shoots germinate, 3 to 5 Baume degree lime sulfur can be sprayed. In the onset period, it can spray 160 times Bordeaux mixture or 50% Benzotex wettable powder 1000 to 2000 times, or 15% zinc supplement. 600 times liquid to 800 times liquid.
A yellow-green round spot appeared on the leaves of summer leaves in the summer, and then turned brown, with scattered small black spots. The diseased leaves died but did not fall off.
Control methods:
(1) Remove and incinerate diseased leaves and spray Bordeaux mixture before germination.
(2) From May to June, spray 65% ​​zeocin zinc wettable powder 500 times, spray once every 7 to 10 days, spray 2 to 3 times. Root cancer occurs mainly in the base of the trunk and sometimes occurs on the neck or lateral roots. The diseased area develops tumors that are initially milky or flesh-colored, gradually turning brownish or dark brown, spherical, with a rough surface, irregularities, and cracks. After the disease is affected, the root system is stunted, and the fine roots are very few. The aboveground parts grow slowly and the tree vigor is weak. In severe cases, the leaves yellow, fall off early, and even the whole plant withers.
Control methods:
(1) Seedlings with root-carcinogenic disease must be destroyed. Seedlings should be soaked in 1% copper sulphate for 5 to 10 minutes before planting, then washed with water and planted.
(2) Found a diseased plant can be used to completely remove the cancerous tumor and its surrounding tissue.
(3) The soil around the diseased plants can also be disinfected with sulphur powder at a dosage of 50 to 100 grams per square meter. At the same time pay attention to soil improvement.
Scale insects have a lot of species of scale insects that cause damage to the cherry trees, including Shuimu Kensuke, Seiji-dongji, Changbai scale insects, and Japanese turtle wax. The adults and nymphs suck the leaf sap to weaken the plants, and some species secrete large amounts of Excreta can easily induce coal pollution, affecting its growth and flowering.
Control methods:
(1) The most favorable period for the control of scale insects is the incubating period of nymphs, spraying 25% impyriphos 600 to 800 times or 40% omethoate emulsion 1000 times.
(2) In the winter and spring spray 5 Baume degrees lime sulfur, or 3% to 5% diesel emulsion to eliminate overwintering nymphs. The effect is good.
Peargrass is mainly responsible for damage to the back of the leaves of cherry blossoms, sucking juice, and there are many spotted brown feces at the victim's site and fly-like feces black at the time of spawning. The entire back of the victim's leaves is rust-yellow, with pale spots on the front. In severe cases, spots appear on the leaves, and the whole leaf loses its green color and shows pale leaves.
Control methods:
(1) Remove weeds in winter, dead branches, leaves, and destroy them.
(2) When a white adult just emerged from the nymphs on the leaves, it was indicated that the first generation of nymphs had basically hatched and should be sprayed and prevented. This is a favorable period for prevention and control. It can be used 90% trichlorfon 1000 times or 50% malathion EC 1500 times, or 40% omethoate 1000 times.
The larvae of the larvae grazing on the inside of the dry skin of the cherry blossoms. The adult body is blue-black and occurs once a year. The larvae live under the skin for the winter, so it can be endangered from the early spring and emerged in the months of August and September. The eggs are produced in the gap between the bark or Dry skin of the wound.
Control methods:
(1) Apply lime paint on cherry branches to prevent spawning.
(2) In the spring, when there are holes in the dried branches and there is a hole in the outside, or when there is insect feces, you can use a hammer to beat to kill the internal larvae or use a knife to cut dry skin to kill the larvae. Then apply fungicide.
(3) Use 50% phoxim EC 700 times to smear or spray all the branches to kill young larvae.
Red spider spider mites reproduce rapidly during the period of high temperature and drought from June to July, and the number increases rapidly. At this time, it is serious. It mainly sucks the cherry leaf sap, causing the victim leaves to lose their green and grayish yellow spots, resulting in dry coking and early falling leaves. The buds are yellow and dry and can not grow leaves, affecting normal growth and viewing, and can cause other pests to invade.
Control methods:
(1) When individual cherry trees have spider mites, they should be removed promptly.
(2) Prior to cherry sprouting in the early spring, the trunk was sprayed with crystal lime sulfur 300 to 500 times to eliminate overwintering female adults and eggs.
(3) spraying 50% Bromoxime ester emulsion 2500 times or omethoate, dicofol and other agents during the damage period.
(4) Due to the tendency to produce antibiotic resistance, it is important to pay attention to the alternate use of acaricides.
Aphid larvae mainly damage the buds of cherry blossoms and buds of new leaves. The sap of plants is sucked by a sucking mouthpart. The parts of the damaged plants grow slowly, the leaves shrink and curl, and the leaves are severely detached. If the buds are damaged, they cannot develop normally, leading to shedding. The insect can also secrete a lot of honey dew, induce serious coal pollution, greatly reduce the ornamental cherry flowers.
Control methods:
(1) When the amount of insects is not large, spray water or combine pruning and cut off the insects.
(2) In the middle and late April, 15% of aldicarb granules were planted at the furthest roots around the cherry trees. The depth of soil buried in each tree was 1 to 2 grams and the depth was 2 cm.
(3) It can spray 1000 to 1500 times of 50% chlorinated pine galenine or 4,000 to 5,000 times of 2.5% deltamethrin EC, or 2000 times of 20% chlorinated EC.
Perforating brown spot occurs from May to June, the leaves appear purple-brown dots, and then gradually expand into a round shape. The lesion site becomes dry and shrinks, becomes small holes, and the pathogenic bacteria mostly overwinter on diseased leaves, and is most suitable for development. The temperature is 25 °C to 28 °C, spread by the wind, in the rainy season is conducive to the incidence of infestation, tree weakness, poor drainage, poor ventilation and light transmission, the disease is serious.
Control methods:
(1) Strengthen the cultivation and management, rational pruning, and take care to cut off the diseased shoots, remove the diseased leaves in time and burn them, so as to create a clean growth condition for the plants.
(2) Before the new shoots germinate, 3 to 5 Baume degree lime sulfur can be sprayed. In the onset period, it can spray 160 times Bordeaux mixture or 50% Benzotex wettable powder 1000 to 2000 times, or 15% zinc supplement. 600 times liquid to 800 times liquid.
A yellow-green round spot appeared on the leaves of summer leaves in the summer, and then turned brown, with scattered small black spots. The diseased leaves died but did not fall off.
Control methods:
(1) Remove and incinerate diseased leaves and spray Bordeaux mixture before germination.
(2) From May to June, spray 65% ​​zeocin zinc wettable powder 500 times, spray once every 7 to 10 days, spray 2 to 3 times. Root cancer occurs mainly in the base of the trunk and sometimes occurs on the neck or lateral roots. The diseased area develops tumors that are initially milky or flesh-colored, gradually turning brownish or dark brown, spherical, with a rough surface, irregularities, and cracks. After the disease is affected, the root system is stunted, and the fine roots are very few. The aboveground parts grow slowly and the tree vigor is weak. In severe cases, the leaves yellow, fall off early, and even the whole plant withers.
Control methods:
(1) Seedlings with root-carcinogenic disease must be destroyed. Seedlings should be soaked in 1% copper sulphate for 5 to 10 minutes before planting, then washed with water and planted.
(2) Found a diseased plant can be used to completely remove the cancerous tumor and its surrounding tissue.
(3) The soil around the diseased plants can also be disinfected with sulphur powder at a dosage of 50 to 100 grams per square meter. At the same time pay attention to soil improvement.
Scale insects have a lot of species of scale insects that cause damage to the cherry trees, including Shuimu Kensuke, Seiji-dongji, Changbai scale insects, and Japanese turtle wax. The adults and nymphs suck the leaf sap to weaken the plants, and some species secrete large amounts of Excreta can easily induce coal pollution, affecting its growth and flowering.
Control methods:
(1) The most favorable period for the control of scale insects is the incubating period of nymphs, spraying 25% impyriphos 600 to 800 times or 40% omethoate emulsion 1000 times.
(2) In the winter and spring spray 5 Baume degrees lime sulfur, or 3% to 5% diesel emulsion to eliminate overwintering nymphs. The effect is good.
Peargrass is mainly responsible for damage to the back of the leaves of cherry blossoms, sucking juice, and there are many spotted brown feces at the victim's site and fly-like feces black at the time of spawning. The entire back of the victim's leaves is rust-yellow, with pale spots on the front. In severe cases, spots appear on the leaves, and the whole leaf loses its green color and shows pale leaves.
Control methods:
(1) Remove weeds in winter, dead branches, leaves, and destroy them.
(2) When a white adult just emerged from the nymphs on the leaves, it was indicated that the first generation of nymphs had basically hatched and should be sprayed and prevented. This is a favorable period for prevention and control. It can be used 90% trichlorfon 1000 times or 50% malathion EC 1500 times, or 40% omethoate 1000 times.
The larvae of the larvae grazing on the inside of the dry skin of the cherry blossoms. The adult body is blue-black and occurs once a year. The larvae live under the skin for the winter, so it can be endangered from the early spring and emerged in the months of August and September. The eggs are produced in the gap between the bark or Dry skin of the wound.
Control methods:
(1) Apply lime paint on cherry branches to prevent spawning.
(2) In the spring, when there are holes in the dried branches and there is a hole in the outside, or when there is insect feces, you can use a hammer to beat to kill the internal larvae or use a knife to cut dry skin to kill the larvae. Then apply fungicide.
(3) Use 50% phoxim EC 700 times to smear or spray all the branches to kill young larvae.
Red spider spider mites reproduce rapidly during the period of high temperature and drought from June to July, and the number increases rapidly. At this time, it is serious. It mainly sucks the cherry leaf sap, causing the victim leaves to lose their green and grayish yellow spots, resulting in dry coking and early falling leaves. The buds are yellow and dry and can not grow leaves, affecting normal growth and viewing, and can cause other pests to invade.
Control methods:
(1) When individual cherry trees have spider mites, they should be removed promptly.
(2) Prior to cherry sprouting in the early spring, the trunk was sprayed with crystal lime sulfur 300 to 500 times to eliminate overwintering female adults and eggs.
(3) spraying 50% Bromoxime ester emulsion 2500 times or omethoate, dicofol and other agents during the damage period.
(4) Due to the tendency to produce antibiotic resistance, it is important to pay attention to the alternate use of acaricides.
Aphid larvae mainly damage the buds of cherry blossoms and buds of new leaves. The sap of plants is sucked by a sucking mouthpart. The parts of the damaged plants grow slowly, the leaves shrink and curl, and the leaves are severely detached. If the buds are damaged, they cannot develop normally, leading to shedding. The insect can also secrete a lot of honey dew, induce serious coal pollution, greatly reduce the ornamental cherry flowers.
Control methods:
(1) When the amount of insects is not large, spray water or combine pruning and cut off the insects.
(2) In the middle and late April, 15% of aldicarb granules were planted at the furthest roots around the cherry trees. The depth of soil buried in each tree was 1 to 2 grams and the depth was 2 cm.
(3) It can spray 1000 to 1500 times of 50% chlorinated pine galenine or 4,000 to 5,000 times of 2.5% deltamethrin EC, or 2000 times of 20% chlorinated EC.
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