Oriental march ants

The scientific name Doxrylus orientalis Westwood is Hymenoptera, formicidae. Alias ​​oriental planted spear ants, yellow ants, yellow ants, yellow silk ants. Distributed in Yunnan, Guizhou, Hunan, Jiangxi, Fujian and other provinces.

Host cruciferous radish, kale, brassicae, mustard, solanaceous eggplant, pepper, tomato, and potato, legumes of green beans, kidney beans, umbelliferae (hus), asteraceae lettuce and other vegetables Plants, as well as watermelons, sweet potatoes, sweet potatoes, etc., occasionally harm citrus. There are also two important weeds of the Asteraceae family, the small fly and scented grass.

The damage is mainly characterized by the worker ants eating the stems, roots, tubers, and roots of the host plant, forming holes or eating, causing the stems and leaves to die yellow; also can eat watermelon, tomatoes and eggplant and other fruits that are close to the ground.

Morphological characteristics Adult ants have size two: large body length 5-6mm, body brown, chestnut brown, abdomen color lighter than the chest; head near square or rectangular, posterior edge deep concave, with a longitudinal groove in the frontal center, antennae 9 sections, There are 2 teeth on the inner edge of the upper eyelid; no compound eye and single eye; the gap between the anterior and middle thoracodorsal plate is not obvious; the abdomen stalk section is 1 and the chest and abdomen stalk section is flat on the back. Small body length 2.5-3mm, dense yellow, no longitudinal groove in the frontal center. Male ants are similar to Vespa, with two pairs of wings, body length 17-23mm, dense yellow hair surface, yellow transparent wings, compound eyes, monoculars are developed. Eggs are long and oval, about lmm long, milky white. The larva is about 2mm long and beige.蛹 oval, about 4mm long, beige.

Life habits winged ants have phototaxis. The eggs are produced in groups of 3-5mm below the host's crest, and there are dozens to over 200 eggs in one place. Workers' ants may be infested throughout the year in parts of low-altitude areas in Hunan's western Hunan Province. However, they have been breeding for 3 times in March-April, May-July and early August-November. Roots, stems, or ground fruits within 3cm are damaged, and “ant mounds” are formed on the soil surface of the host's crotch by manure, and “tunnels” are formed in the earth under the mound. The normal depth of life is 15.5cm deep under the soil.

Control methods (1) Eradication of weeds such as small fly bonnets, vetiver grass, etc. (2) In the event of damage, especially in the peak period of damage, if there is "small anthill" in the sternum or only leaves dry, immediately use 25% thiophos-phor EC 1500 times; every 10 days or so, use it together. 3 times. (3) Use “killing bee (A) ant medicine” for short term “cockroach killer” with 1 to 3 tubes for every 15m2, 2g for each tube, 10 to 30 piles, place the medicine in glass at high humidity Inside the bottle, you can kill ants for a long time, and you can also treat bees. (4) 90% crystal trichlorfon plus lime 1:1 water 4000 times liquid, each litter irrigation good liquid medicine 0.6kg, control effect 100%, 7 days before harvest to stop medication.

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