The corn iron beetle is a Coleoptera, leaf armour, is a localized pest. Iron iron beetle mainly damages corn and can also harm wheat, sorghum and millet. Wild hosts have to watch Apia and so on. In addition, adults generally eat grasses such as thatch. In China, there were more than 10 counties such as Longzhou, Daxin, Jingxi, and Debao in Guangxi, and Luoxun and Wangmo in Guizhou Province. In recent years, Guangxi has gradually expanded to the southeast. After the corn iron beetle infested the corn, it had a great impact on the yield. When the damaged area of ​​the leaf of the corn reached 1/4 of the leaf surface, the patch showed a white leaf. If the dry white leaf occupied 10% of the total leaf, the corn could reduce the yield. ~12%; when the dry white leaves account for 20 to 30%, the output is reduced by 25 to 30%; when the dry white leaves account for 30 to 40%, the output is reduced by more than 40%. Therefore, understanding the characteristics of the damage caused by iron beetles and adopting appropriate control measures is a guarantee to reduce the loss of corn production. 1 Damaged larvae and adults are all fed with corn leaves. In late March each year, adults migrate from wintering sites and feed on the corn. They attack and eat on the leaves along the leaf veins, forming white lines of varying lengths due to adult worms. Less food and lighter corn damage. In mid-April, adults laid eggs on the leaves. After hatching, the larvae sneaked into the leaf epidermis to feed on the leaves until they became phlegm. The larvae had edible edible leaf area of ​​8 to 10 cm. After the leaves were damaged, only the epidermis was left, forming white. Stains. Commonly known as corn "wearing a flower", in the case of a large density of insect population, the leaves are often wilted into a white, commonly known as "wear white." 2 The law of occurrence of corn iron beetles occurred in Guangxi in 1 year, a few generations. The first generation occurred in large quantities and seriously damaged spring maize. The second generation occurred in small quantities and was less harmful. The first generation egg-laying period is at the end of April, mid-April and late May. It is the end of spawning period and the egg period is 6-7 days. The larvae hatched in early April and hatched in mid-April and mid-April to mid-May. The duration of larvae was 18 to 25 days. Larvae begin to phlegm in early May and last for 9 to 11 days. In late May, eclosion began as an adult, and in the middle and early June, it was the peak of emergence. In July, the maize gradually matured, and the leaves of the first-generation adults migrated to the sugarcane field or the wild side of the mountain to feed on the parasites. A small number of adults can breed and spawn second-generation breeding, which damages the autumn corn. The second-generation adults first emerged in August, late in the middle of September, and in mid-September. In October, adults migrated to mountainsides and slopes. Weeds in grass or sugar cane fields. There was no apparent dormancy in overwintering adults. The offspring that are bred by overwintering adults are the basic populations that injure the spring corn seedlings. Therefore, the number of effective populations of overwintering adults becomes an important factor in whether disasters occur in that year. When 4 to 5 leaves of spring corn are grown, the adults colonize and feed on the corn seedlings to mate. Adults have a false death and are slightly disturbed, that is, false deaths. It was slow to move in the early morning and was more active after 10 hours. Adults have habits of clustering damage to green, growing corn seedlings. Therefore, it is better to sow seedlings earlier and have better seedling quality than late seeding and poor seedlings. Rainfall has an impact on adult activity and reproductive offspring. If the number of days of rain falls from March to April is less than normal, and the rainfall is below 100 mm, it is conducive to adult activity, mating and spawning. In spring, the damage of spring corn is heavier. In April-April, when the number of days of rainfall exceeded 25 days, and the rainfall was more than 165 mm, it was not conducive to adult activity and reproduction of offspring, and spring maize suffered less damage. In the mountains and the foot of the mountain, the damage to the corn is heavy, and the damage to the hillsides is light and the top of the slope does not occur. 3 Prevention methods (1) Artificial killing uses the habit of sluggish early morning activities in adults. From late March to early April, before 9:00 a.m. or after 4 p.m. every day, there are organized, organized, artificial killing of adult activities, which can reduce the number of The amount of eggs laid and larvae are harmful. (2) Chemical control When the hatching rate of eggs reaches 10%, chemical control can be carried out. The agent can be sprayed with 25% insecticidal bi-quenches 500 times solution, 50% dimethoate emulsifiable concentrate 1000 times solution, etc. You can also try 1.5% dimethoate powder or methyl phosphonium powder 1.5 to 2 kg per mu. (3) Cutting the leaves to clear the larvae The mature larvae in the middle of May can be defoliated in the leaves. The worms can be used to cut insects in the leaves. Attention should be paid to the preservation of the green zygote and the healthy leaves, and the residual leaves with the larvae and larvae cut off immediately. Effectively reduce the amount of debris and control the amount of occurrence in the second year. (4) The removal of weeds in the field and the stripping of the old leaves in combination with sugar cane field management can destroy the wintering sites of the debris.
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