During the spring tea period, the overwintering adult black thorn mealybugs generally occur, green bugs occur in large quantities in some tea areas, and aphids, tea caterpillars and gray tea loopers occur in small amounts. With the completion of tea garden pruning, the tea trees enter the summer tea germination round.
The specific predictions of recent pest occurrences and suggestions for prevention and control technical measures are as follows:
Gray tea looper: At present, most of them are in the 2 to 3-year-old stage. The number of occurrences in this generation is small and no separate chemical control is needed. In plots where gray tea looper occurs, insects trapping machine can be hung in late May for prevention and control, 1-2 sets per mu; in tea gardens where insecticidal lamps are installed, it is necessary to promptly check whether the insecticidal lamps are working properly.
Tea green leafhopper: The temperature and humidity are suitable in early summer. Tea green leafhopper breeds rapidly. The summer tea germination period will enter its first peak period. It is recommended to hang 25-30 Insects Trap board after pruning to control the number of insect populations and reduce the peak; nymphs For larger tea gardens, it is recommended to spray 0.5% veratrum rhizome extract, matrine, Metarhizium anisopliae and other biopharmaceuticals; for chemical control, buprofen, dinotefuran, acetamiprid, sulfonicamid, and acetamiprid can be used Chemicals such as amide, indoxacarb, difenthiuron, and bifenthrin are registered on tea trees.
Tea caterpillars: The overwintering tea caterpillar larvae in the tea gardens of southern Jiangsu first appeared on April 9 and are currently in the pupal stage. It is expected that the adults will begin to emerge on May 30 and enter their prime stage on June 5. The peak period will be June 8-10. Day; in tea gardens with low occurrence, tea caterpillar sex traps can be hung at the end of May to trap and kill male adults. The peak hatching period of second-generation tea caterpillar larvae is expected to be July 1-5. Tea gardens with severe infestations can be controlled by spraying Bacillus thuringiensis at the early stage of larvae (before 3rd instar); chemical pesticides can be cypermethrin, deltamethrin, and combined Phenothrin and other chemicals are sprayed using a tea garden sprayer.
Mites: Tea gardens are dominated by tea orange gall mites in summer. Pruning after the end of spring tea removes a large number of mites, effectively suppressing the number of occurrences during the first peak period. With the germination of summer tea, the number of occurrences gradually increases. To effectively control the occurrence of harmful mites, after the tea tree germinates, you can use more than 95% mineral oil according to the required dosage, or use veratrum rhizome extract, azadirachtin, pyroprofen and other chemicals for control.
It is recommended that on the basis of ecological regulation of tea gardens, the application of pest control measures such as physical control and Tea Pruner pruning should be strengthened, and biological pesticides and mineral source pesticides should be used to control the occurrence of pests during critical periods.