Main insect conditions in early summer tea
1. Tea inchworm
The occurrence degree of the second generation of tea inchworm is heavier than that of the first generation and similar to that of last year. According to the investigation of larvae in the field of Jingshan tea at this station, it is predicted that the suitable period for field control of the second generation is from June 2 to June 8. 2.5% kungfu (25ml / mu), 2.5% enemy kill (25ml / mu), 0.5% matrine (No. 4) (50ml / mu) can be selected, and the safe interval after spraying the above pesticides is 7 days.
False-eyed small green leafhopper
The false-eyed small green leafhopper is a moderately heavy occurrence year this year, and the first peak is from the beginning of June to the early stage of high temperature and drought. The appropriate period for control is in early June, and the specific control time should be controlled when the nymphs (crawling) in the field account for more than 80% of the total number of insects. 10% imidacloprid (15-20 grams per mu) can be selected and sprayed. The safety interval was 10 days after treatment.
III. Tea Elephant Beetle
The tea weevil, also known as Flower Chicken, is one of the main pests in the tea garden in our region, and this insect occurred moderately this year. It is predicted that the appropriate period of control is from May 30 to June 5. The medicament can choose 2.5% Uranus (60 ml per mu) and spray the noodles. The safety interval was 10 days after treatment.
Fourth, tea orange gall mite
The tea orange gall mite occurred in a moderate degree this year, and the damage degree of the tea garden was lighter than that of the young tea garden and the modified tea garden, especially in the tea garden which was not sealed with stone-sulfur mixture at the end of last autumn. The suitable period for control is in early June. Tea gardens that do not pick tea can be sprayed with 1% mifenac (20 ml per mu) or 0.6% mifenac (30 ml per mu).
5. Other pests
Tea black moth occurs lightly this year, and most tea gardens do not need to be controlled with medicine. a few tea gardens with tall canopy and close to the forest belt may have a certain number of insects. The suitable control period of the second generation is predicted from June 10 to 15, with 2.5% Uranus (20 ml per mu) plus 80% dichlorvos (50 ml per mu) and a safety interval of 7 days.
The tea moth occurs lightly this year, and a few young tea gardens or modified canopy tea gardens need to be controlled. the appropriate period for the control of the second generation is in early June, and the insecticides can be used to kill 2.5% of the enemy or 2.5% kungfu (10ml / mu).
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Seedling raising techniques of short-spike cuttings of tea trees in summer and autumn
First, nursery production 1. Choose a place. It is required that the yellow soil without tobacco, hemp and vegetables can also be selected as sandy soil or red soil; the soil pH value is 4.5 to 5.5 and the content of organic matter in the soil layer of 015 cm is less than 1.5%; it is required to be watered conveniently and close to the bottom of the water source. two。 Prepare the ground. First plough the soil 25cm to 30cm, and then refine the soil 20cm on the surface several times to ensure that the soil is broken and flat. 3. Make a bed. The border is east-west in summer and east-west in autumn. The width of the bed is 1.2 meters and the height is 8: 10.
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Occurrence and control of main tea pests during summer tea
Due to the low temperature rain and snow weather in last winter and this spring, the base number of tea overwintering pests is low and the occurrence time is delayed, and the harm of spring tea is mild, but the weather in summer is more suitable for the occurrence and harm of diseases and insect pests. therefore, it is necessary to do a good job in the monitoring and control of diseases and insect pests. The occurrence degree of whitefly was lighter than that of last year, but the number of insects in some tea gardens still exceeded the control target. According to the investigation of Songyang County Plant Protection Station, the peak of overwintering adults was on April 15, with an average population of 17.4 louvers, which was later and less than that of last year (April 5).
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