Starscream, also known as Cotton Starscream, Dragon, Salon, etc. , belonging to Acari Tetranychidae, sucks mouthparts to absorb plant body fluids. It is widely distributed all over the country, and its food habits are miscellaneous, which harms plants 1 13 species, mostly young leaves and stems of plants. Adult mites, juvenile mites and nymph mites suck juice on the back of leaves to form a silk screen. Sporadic chlorosis spots appeared on the leaves at the initial stage, and in severe cases, white spots were all over the leaves, the leaves turned gray, and the whole leaves dried up and fell off.
Life habit of Starscream: 10-20 generations from north to south 1 year. Male diapause mites in the north overwinter in litter, roots of weeds or soil cracks in bark; The Yangtze River basin mainly overwinters with female adult mites and eggs. In February-March of the following year, when the temperature was above 65438 00℃, the overwintering female mites went out to sting and began to reproduce. At first, it occurred in a small stage, and then spread around, first damaging the lower leaves, and then transferring to the upper leaves of plants. Adult mites crawl, rotate and droop in the forest, or farm work is spread by people and tools. The female mite of 1 can lay 50- 1 10 eggs, which shows parthenogenesis. The optimum temperature for growth, development and reproduction is 29-365438 0℃ and the relative humidity is 35%-55%. High temperature and low humidity are beneficial to its occurrence. Extensive management, the older the plant leaves or the higher the nitrogen content, the faster the mites reproduce and aggravate the harm.
Control measures of red spider;
(1) Simple and time-saving method: regularly remove the dead leaves in the flowerpot and sweep away the spiders with a brush.
(2) Remove litter until the whole basin is covered with soil, and eliminate the overwintering insect source. Reasonable irrigation and increased application of phosphate fertilizer can make plants grow healthily and improve their ability to resist mites.
(3) chemical control, strengthen the inspection of insect situation, and carry out selective treatment when spot disease occurs. If it has spread to the whole plant, it should be sprayed on the whole plant. The types of chemicals can be 300 times that of 45% sulfur gel suspension, 20% pyridaben EC 1000 times, and 5% nisolone EC 2000 times. You can also use 2.5% Uranus pore oil 2000 times solution, 2 1% Misa EC 2000-4000 times solution, 5% Kazak EC 2000 times solution, etc. These are all drugs absorbed by leaves, which can make spiders have stomachache, stomach acid and gastric ulcer, and ensure the cure of drugs.