The scientific name Oligonychus coffeae (Nietner) belongs to the order Acrididae. Alias ​​coffee small claw clam, tea red spider. Distribution of Jiangxi, Yunnan, Guangdong, Guangxi, Fujian, Taiwan and other provinces.
Host tea, camellia, coffee, cotton, citrus, acacia, marshmallow, rubber and so on.
At the beginning of the damage, the damage was done on the young shoots. After spreading to the surrounding areas, the affected leaves turned red or dark red and dull. The leaves were white dust and very small spider silk, causing the leaves to harden or dry off.
The morphological characteristics of female worm oval, body dorsal bulge, body length of about 0.4 to 0.5mm, width 0.15 to 0.23mm. The first half is red, the latter half is dark red, and the back of the body has 4 rows of vertical hairs, 6-7 roots in each row, abdomen and abdomen, broadly rounded, 4 pairs of feet; the males become smaller, the abdomen is slightly more pointed, and the feet are smaller. Females become long. Egg length 0.11mm, nearly round, red, light orange before hatching, flat below, a white hair above. The larvae are 0.2mm long, 0.1mm wide, nearly round, bright red, turn dark red, and 3 pairs of feet. If the first one is ovoid, 0.2mm long, 0.13mm wide, dark red, 4 pairs of feet; the second female is 0.26mm long, 0.15mm wide, abdomen rounded; .23mm, width 0.14mm, slightly pointed at the end of abdomen. 4 pairs of feet.
Living habits About 15 generations of birth in Fujian, all year round, no significant period of dormancy, overlapping generations. Different seasons have different insect states and durations. In July, the first generation is about 12 days, and in October it is 18 days. Females live for 10 to 30 days, and they mainly reproduce sexually, and they can also perform parthenogenetic reproduction. Unfertilized eggs hatch into males, and the eggs are spawned near the main veins or depressions. Each female lays an average of 40 eggs, more than one hundred grains, and produces eggs one to six times a day. If the skin turns into pods after 2-3 times, it can be seen in the upper part of the sunny tea groves. Pre-spring and post-autumn conditions are neither cold nor hot, and high-temperature development stagnates in the summer.
Prevention methods (1) Strengthen the management of tea gardens, prevent the tea garden from being too cold, timely watering the dry season, and making the microclimate affordable. (2) When spotting occurs, spray 15% chlorfenuron EC 3500 times solution or 20% chloral chrysanthemum EC 1000 times, 73% chlorate EC 2000 times, and 10% EC 2000 times, 1.8% Abirubin EC 4000 times, 1.8% Chizilla EC 5000g, 20% ECS 4000 times. (3) After the end of autumn tea in mid-October, Baume 0.5 lime sulfur was sprayed in front of the female's underarms.
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