Guava Cultivation Technology and Pest Control: Prevention and Control of Diseases and Pests of Fruit Trees

5. Spiral fly aphids can occur throughout the year, from January to March by low temperature breeding more slowly, the damage is also more moderate; temperature increased slightly in April-May, its population density slightly increased; June-September due to rain and At high temperatures, the density dropped drastically, remaining on the leaves of the base of the crop or plants under the shade; after 10 months the rainfall gradually decreased, the climate turned to be arid, its density increased, peaked in November, and affected by low temperatures after December The density is slightly reduced. With the uncontrolled garden, or without the most serious prevention and control gardens, and generally there are orchards for pesticides to control pests, it is difficult for the worm to survive. (2) Prevention and cure methods 1 Cut off and burn off serious branches and leaves of the insects to prevent the adults from spreading and infecting newly planted young plants. 2 When pests occur, they can spray 90% Methomyl (Wan Ling) WP 3000 times, spray once a week, 2-3 times in a row, and then reappear depending on the circumstances. 6. White Spotted Starlings (1) Harm and Occurrence The Starlings are commonly known as hoops, buffalo horns or worms. In the past, Casuarina and Tartary Buckwheat were the most common occurrences. In recent years, they have become the major pests of litchi, citrus, Indian date, and guava. This worm occurs annually in the first year, and it occurs in the high-cold area in 2 years. Adult body length 2.5-3.5 cm, appeared in April-September, May-June is the peak of emergence. In the early stage of adult spawning, adults often inhabit the branches and leaves and eat the tender shoots, causing the shoots to die. Spawning on the trunk is more than one meter from the ground, but if the trunk is thicker than ten years old, the spawning site will move upwards. Before spawning, the bark should be bitten into tectonic cracks by mouthparts. One egg is laid per seam, each female lays eggs, 8-20 eggs, and the egg period is 7-10 days. After hatching, the larvae circumnavigate the inside of the cortex and feed on the xylem 1 month later, resulting in a number of tunnels. The wormholes are visible on the outside of the victim's area for ventilation, defecation and rowing of wood powder. In general, 1 strain of insects is harmed, but those with thick trunks may also have 2-3 larvae at the same time. In severe cases, insects and tracts are connected. When the larvae revolve around the trunk for a week or a half, the victim's leaves turn yellow, and the fruit dies or even dies. The larvae last for up to 10 months until the second year of spring, with a 1-2 week flood season. (2) Prevention and control methods 1 Kill adults (usually early in the morning their flying force is weak). 2 Find a wormhole and use a wire or screwdriver along its tunnel to puncture the larvae to death. 3 The raw solution of cotton cricket insecticide (such as trichlorfon) was stuffed into wormholes and then sealed with mud to kill the larvae. In April, 40.64% Carbofuran suspension powder was sprayed on 100 times, around the main trunk, adults were laid to protect eggs, and then applied once every month until September. Or before the emergence of Starlings adults, the trunk was wrapped in gauze to block their spawning. Can also be used to wrap the trunk of straw, and other adults lay eggs and burn them up. 7. Injurious and Occurrence Laws of New Shoot Pests (1) The pests of the new shoots include the leaf roller moth, dusty fly, and red leaf curl weevil. The damages of the new shoot pests are the most in the angle of the leaf roller moth, followed by the floating dust, and the red rolling leaf weevil. less. In addition to the rainy season, the leaf-rolled leaf roller moth can be seen all year round. Adults lay eggs on new shoots. After hatching, the new leaf of the larvae reel leaves or knots a few leaves in one place, and is used for loosening, thinning, and defoliating. The cessation of the development of new damaged leaves has a great influence on plant growth. In addition to damaging new shoot leaves, the leaf roller leafworm still eats the epidermis of the young fruit, causing large scars on the fruit surface and affecting the appearance quality of the fruit. --------(Unfinished) ------- China Agriculture Network Editor


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