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1, fake eyes small green leaves. The adult is yellow-green to green, and the adult and nymphs suck the young shoots of the tea tree. The leaves of the affected tea leaves are yellow, the veins become red, the growth of the shoots is blocked, the sprouts are not developed, and the young shoots are scorched in severe cases until the tea garden is harvested, which seriously affects the yield and quality of the tea. The peak period occurs in June and September to October each year. The nymphs are inactive during rainy days and morning dews, and the rain, nourishment and weedy tea gardens are good for the insects.
Control measures: 1 strengthen the management of tea gardens, remove weeds in time; 2 suppress the development by batching tea or lightly cutting eggs in batches; 3 spraying humidity of 0.1-0.5 billion spores/ml of Beauveria bassiana or plant source The medicament is used for prevention and treatment; 4 when it is heavier, the garden is sealed with stone sulfur mixture in winter to prevent the adult from overwintering. 52.50% rotenone 150-200 ml (300-500 times) de-worming.
2. Tea caterpillars. The adult female moth is yellowish brown, the male moth is dark brown, the larva is yellowish brown, and yellow poisonous hair is on the back and sides. The larvae are clustered, and after 3 years of age, the larvae are scattered and the leaves are nicked after biting. Adults have phototaxis, and the pests have peaks in April-June and July-September.
Control measures: 1 manually remove the egg mass and insect population every winter; 2 combine the cultivation to deeply bury the mites; 3 use light or sex hormones to kill male adults; 4 spray bt preparations in the young larvae.
3, tea ruler. The adult wings are grayish white, and the larvae feed on the young leaves to harm the tea trees. When the damage is serious, the young leaves, the old leaves and even the tender stems can all be eaten, which not only seriously affects the tea yield in that year, but also causes the tree to weaken and is difficult to recover within one to two years. It poses a great threat to tea production. Its larvae have silky drooping characteristics, and adults have phototaxis.
Control measures: 1 combined with autumn and winter cultivation, deep burial or pest removal; 2 put chickens to remove insects; 3 light traps adult insects; 4 use sex pheromones to trap males, interfere with mating; 5 spray tea prion preparation; 6 in larvae Spray bt preparation control.
4, tea thorn moth: adult worm is brown, strong phototaxis. Eggs are scattered in tea bushes, and larvae feed on leaves. The germination period of each generation is from late May to early June, mid-July and late July, and mid-to-late September. Control measures 1 use the adult's suspended animation, artificial killing after the earthquake; 2 spraying Beauveria bassiana; 3 deep ploughing in winter, reducing the number of wintering insects.
5, tea orange and tea leaves. Tea orange is carrot-shaped, orange-red, and the tea leaves are oval, purple-black. Chengyu uses a needle-shaped mouthparts to suck the leaf juice, mainly to damage the young leaves, the main veins of the victim are red, the brown rust spots appear on the back of the leaves, the luster is lost, the leaves are atrophied, the rust spots appear, the leaves are brittle and fragile, and the leaves are caused by serious . Summer tea suffers the most, followed by autumn tea. High temperature and drought are beneficial to its occurrence.
Control measures 1 timely and batch tea collection, can inhibit the further development of the insect; 2 spray Liuyangmycin; 3 occurs in a heavier year, can spray 0.01-0.02 degree stone sulfur mixture and sulfur suspension agent, young leaves spray Shi.
6, black thorn powder. The adult is grayish white and has the ability to fly. The larva is the main insect state of black tea mites that harm tea trees. The nymphs parasitize the sap in the back of the leaves, secrete excretions, fall to the front of the lower leaves, induce tobacco mold, hinder photosynthesis, resulting in weak tree, sparse leaves, depletion of branches and leaves, causing tea trees to die in severe cases. The insects are close to the stagnation, and it is easy to occur in large areas in the middle and lower tea gardens of the middle and lower leaves of the tea bushes and in the tea gardens after several years in the Taiwanese plaque. The distribution in the tea bushes is more in the middle and less in the upper part.
Control measures: 1 timely pruning, thinning, cultivating and weeding, so that the tea garden is ventilated and light, can reduce its occurrence; 2 spray 500 times solution of black thorn fungus fungus preparation, or manually remove the damaged tea branches; 3 pay attention to protection Black thorn powder mistletoe peak; 4 sprayed with 0.5 degree stone sulfur mixture on the back of tea leaves.
7. Tea anthracnose: It is the most common disease in tea gardens. It is caused by infection by pathogenic fungi. When the disease occurs, it mainly damages the leaves. It first produces water-stained yellow-brown spots on the tip and leaf margin. The spot changes from yellowish brown to burnt yellow, and finally grayish white. The lesions are semi-circular or irregular, with many black small spots scattered later. The peak season is from May to June and September to October. The tea gardens with weak tree, extensive management, excessive picking, freezing damage and heavy pests are prone to occur.
Control measures: 1 strengthen tea garden management, rational fertilization, anti-freeze and pest control, improve the disease resistance of tea garden; 2 timely clean up diseased leaves to prevent the spread of germs; 3 spray 0.6%-0.7% lime half-bored Bordeaux mixture before germination to prevent it from happening.
Common pests and diseases of organic tea gardens and their control measures
Organic agriculture refers to an agricultural production system that does not use synthetic fertilizers, pesticides, growth regulators and feed additives. The development of organic agriculture is a new agricultural model that abides by the sustainable development of agriculture. Since no synthetic pesticides should be used in the production process, pest control has become a key task in the production of organic tea. Common pests and diseases and their control measures are as follows:
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