The corn thrips are the main pests in the corn seedling stage. They are small in size and concealed from the active parts. They are not easy to be found. They use the adult or nymphs to suck the young leaves juice in the corn heart, destroying the corn growth point and often making the corn leaves. The yellowing is chlorotic, and the heavy ones make the corn heart curls into a "bull tail" deformed growth, and the internodes are shortened, which is what the growers often say as "corn twisting core", which seriously affects the normal growth of corn. Drought is beneficial to its large occurrence, and rainfall has a direct inhibitory effect on its occurrence and damage. At present, the temperature is high and the precipitation is less, which is very beneficial to the hazard of the thrips. Morphological characteristics Female adults are divided into long-winged, semi-long-winged and short-winged. The body is small, dark yellow, and there are dark gray spots on the chest. The front wing is grayish yellow, long and narrow, with few wing veins but significant, and the wings are long. The semi-long-winged wings are only up to the fifth section of the abdomen, and the short-winged wings are slightly lobed in the shape of a long triangle. Egg-shaped kidney, milky to creamy yellow. The nymph has a body color of milky green or milky yellow, and the body surface has a swelled granule. The 蛹 or the former “蛹†(ie the third-instar worm) is light yellow, the winged bud is white, and the sputum is brown when it is feathered. Law of occurrence In the spring, the yellow flower is firstly propagated on wheat and other crops, and the latter part is gradually transferred to spring corn bacteria. Due to the large area of ​​wheat, the source of spring corn and medium corn is mainly from wheat. class. Generally, from the end of May to the beginning of June, there is a nymph peak in wheat and spring corn. In June, there is another adult peak in wheat, spring corn and medium corn. In June, there is a nymph peak, 7 In the first half of the month, an adult peak appeared on spring corn, middle corn and summer corn. Therefore, the emergence of these several peaks, in the prevention and control, should take timely measures according to the situation of the insects. Corn thrips hazard characteristics Hummer prefers dry conditions, and occurs in low-pitched, windy and arid corn fields. Interplanted corn in small and sparsely populated plots of wheat plants is often seriously affected. The rains from May to July in the year have a greater impact on the occurrence of thrips, and drought and rain are beneficial. In general, the number of occurrences on corn is spring corn > medium corn > summer corn. Although the amount of single insects on the intercropped corn is less than that of spring corn, it is more severely damaged and is more severely damaged in the absence of water and fertilizer. Adults are slow-moving, and most of them are harmful on the opposite side, resulting in discontinuous silver-white food grains with worm stains. The corresponding parts of the front of the leaves show yellow streaks. The adult lays eggs in the mesophyll of the feeding place, and the white point of the needle tip is visible to the light. Most of the damage is concentrated on the second to fourth or second to sixth leaves from the bottom, even if the new time grows, it rarely turns to the new mouth. Prevention 1. Artificial control: (1) Remove the weeds in the field and remove them from the field to effectively reduce the number of insect populations. (2) When combining the seedlings in the field, remove the seedlings and bring out the destruction outside the field to reduce the spread of the thrips. (3) Strengthen management, timely irrigation and fertilization, change the microclimate in the corn field, increase the humidity, and effectively reduce the damage of the thrips. (4) For the corn seedlings that have formed the "bull tail", a part is removed from the top, or an awl is inserted from the base of the whip leaf, and the opening of the heart is promoted to promote normal growth of the heart leaf. 2. Chemical control: Optional 10% imidacloprid wettable powder 15-20 grams per acre, or 4.5% beta-cypermethrin EC 30-50 ml, or 40% chloranthrin? thiamethoxam water dispersion granules 8-12 grams, water 30- 45 kg, evenly sprayed. When spraying, pay attention to spraying corn kernels and fields, weeds in the field, and also treat pests such as gray planthoppers and armyworms. pay attention: 1. The horses linger in the night, try to use the medicine in the morning or evening. 2. For the spraying of nicosulfuron-methyl herbicide in the corn seedling stage, do not spray pesticide pesticides containing organic phosphorus to avoid phytotoxicity.
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