Identification and control of tea small green leafhopper
Small green leafhopper, also known as floating dust, is the most important pest of tea trees. It is harmful to nymphs and adults to suck the sap of tender shoots and leaves of tea trees, causing the leaves to yellowing and losing green, the veins turning red, the leaves thick and old, and when serious, the tip and edge of the leaves are red-brown and scorched, the leaves of the buds are shrunk, the growth is stagnant, and even all of them are scorched like fire. When the injured leaves are made into dry tea, the broken powder increases, the taste is bitter and astringent, and the yield and quality are seriously affected.
The adult of small green leafhopper is 3.5 mm long, light green to yellowish green, with two small green spots in the middle of the head and white bands in the middle of the middle of the head. The front wing is yellowish green, the leading edge is green, the wing tip is transparent or smoky brown, the egg crescent is about 0.8 mm long and 0.15 mm wide, initially milky white, gradually turning light green, and a pair of red eye spots can be seen at the front end before hatching. The nymph was 5 years old, which was milky white at the beginning, and gradually changed from yellowish to green with the increase of age. The wing buds began to appear at the 3rd instar, and reached the fifth ventral segment at the 5th instar.
Prevention and control measures:
For the control of small green leafhopper, on the basis of strengthening the management of tea garden, targeted agricultural measures should be adopted, such as timely weeding, multiple picking in batches, timely pruning in winter, etc., so as to reduce the insect population, avoid blind application of pesticides, and strengthen the protection of natural enemies. The key point of prevention and control is to control the first insect population peak and avoid the damage of the second round of tea. In the occurrence season, chemical control should be carried out timely according to the forecast of insect situation, and imidacloprid (such as lice aphid), Yousheng, Aktai, kung fu and so on can be selected.
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The cause of the death or bud shedding of rhododendron
Rhododendron is one of the ten most famous traditional flowers in China with beautiful tree shape and colorful flowers. it is a common flower for landscaping, indoor potted plants and bonsai production. There are many reasons for the shedding or death of rhododendron buds, mainly as follows: rhododendron is suitable to grow in acidic sandy soil rich in humus, strong permeability and pH 5.0 to 6.5, and avoid alkaline soil and clayey soil. The planting land is alkaline or viscous and the air permeability is not strong, which can easily lead to poor plant growth, bud shedding and even death. If the concentration of fertilizer is too high or unripe raw fertilizer is applied, it will
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Water and Fertilizer Management of Rhododendron
Cuckoos like weak acidic water, avoid saline-alkali water, watering with river water, Rain Water is better. When pouring tap water, it should be stored for more than 12 hours before it can be used. Families who cultivate a small amount of rhododendron can use goldfish water, which contains nutrients, which is conducive to the growth of rhododendron. The water quality in the north has some alkalinity, so ferrous sulfate can be added to adjust the PH value. When the cuckoo is watered in winter, the water temperature should be close to the soil temperature, and the difference should not be more than 2 ℃. Rhododendron is a shallow-rooted plant, watering should grasp the principle of "see wet, do not dry do not water, watering must be thoroughly". As for
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