The scientific name Anaphothrips obscurus (Muller) is from the order Diptera, Thripidae. Different name Anaphothrips striatus (Osborn). Alias ​​corn Hummer, corn yellow horse, grass horse. Distributed in North China, Xinjiang, Gansu, Ningxia, Jiangsu, Sichuan, Tibet and Taiwan.
Host corn, broad beans, bitter English vegetables and wheat and other grass crops.
The main features of the damage are adults that cause serious damage to the plants. The leaves on the back caused damage to the back and showed intermittent silver-white streaks. Along with the small stains, the part of the leaf opposite to silvery white showed yellow streaks. The back of the severely affected person is coated with a layer of silver powder on the back of the leaves, and the end half of the leaves are yellow and dry and even destroyed. In 1998, 100 500 strains of wheat were planted in Juye County, Shandong Province. The number of insect pests was 500-3200, which caused serious damage and should cause production attention.
Morphological characteristics Long-wing female adult body length 1.0-1.2mm, yellow slightly darker, chest, ventral (except the end of several sections) have dark areas. Antennae were light yellow in section 1 and yellow in sections 2 to 4 and gradually darkened. Sections 5 to 8 were dark gray. There is no long hair on the head and chest. The tentacles are 8 knots, the 3rd and 4th knots have a forked feel cone, and the 6th knot has a light oblique seam. The forewings are yellowish, and the anterior venations are interrupted. The vast majority of them have 2 terminal iliac crests, a few of them, and the venation ridges are significantly wider than the anterior chest. There is a complete comb on the posterior edge of the abdominal dorsal plate every eight knots, and the ventral tendon is long and dark. The semi-long-winged forewings reach the fifth quarter of the abdomen. The short-winged forewings are short, degenerate into triangular buds, and have a winged thoracic stenosis that is barely wider than the anterior chest. Egg length 0.3mm, width 0.13mm or so, kidney-shaped, milky white to milky yellow. The newly hatched nymphs are as small as the tip of a needle, the head and chest occupy a larger proportion of the body, and the antennae are thicker and shorter. After the second instar whey or milky yellow, there are gray markings. The end of the tentacles is gray. The physique is very short, only the ninth and tenth belly are longer. There are 4 meibomian nodules on every nine abdominal segments. The front ridge (3rd instar) was yellowish on the head, chest, and abdomen. The antennae, wing buds and feet were pale, and the compound eyes were red. The antennae were not distinctly segmented, slightly sheathed and extending forward. The physique is short and sharp, with a long flank on every eight abdominal segments. There are four curved teeth on the back of the ninth abdominal joint. The raccoon (4th instar) antennae are sheathed on the head and back to the chest. The wing buds are longer and brownish when approaching feathering.
Living habits are not known in the annual generation, and adults live over the winter in the grass roots and dead leaves. Is a typical leafy species. In spring and mid-May, from the graveous plants to the corn, two generations of corn are propagated. The first generation of nymphs occurs in spring corn or wheat crops from late May to early June, and enters into the adulthood in mid-June. June 20 is the peak of the egg and in late June is the nymph prosperous period. In early July, the adult is on the summer corn. This is parthenogenetic. Adults have long-winged, semi-long-winged, and short-winged types. They are slow-moving, inactive, and rarely active during the rain. They are also reluctant to move after being frightened. The adult feeding place is where it spawns. The eggs are produced in the leaf tissue, and the eggs back out of the leaves. The newly hatched nymphs are milky white. Adult larvae and 1,2 instar nymphs cause nymphs to gradually turn milky or milky yellow after feeding. The 3rd and 4th instar nymphs stopped feeding and fell into loose soil or hidden in leaf sheaths and dead leaves of the plant base. In mid-June, the adult fleas were mainly responsible for the damage, and the number of nymphs increased in late June and early July. The worm has the habit of transforming the host. Drought is beneficial to its occurrence. Rainfall has a direct inhibitory effect on its occurrence and damage.
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