Yellow apple (Spirulina radix)
Apple Astragalus Aphis?pomi?DeGeer, belongs to the order Homoptera, Aphididae. Also known as the apple tart and the spiraea. The host has apple, pear, peach, plum, apricot, betel nut, jellyfish, cherry and hawthorn fruit trees. The morphological features of the non-winged female are about 1.5 mm in length, yellow or yellow-green. The ventral tube is medium in length, cylindrical in shape and tapered at the end. The head, ventral eyes, and abdomen are black. The winged females are younger and smaller. Her head and chest tube are black and her abdomen is yellow-green or green with dark spots on both sides. The egg is oval in shape with slightly pointed ends, approximately 0.6 mm long and black in paint. The nymphs are bright yellow, and the antennae, feet and abdomen are black.
? Occurrence characteristics? Apple astragalus in the middle of our province in general about 15 generations, the egg in the shoots buds or split skin gap in winter. Incubation begins in early April and the middle of the following year. The present generation is a wingless female nymph. The nymphs and adults cluster suck juice on shoots and shoots. The next generation is mostly winged, injuring buds and young leaves. Later generations are mainly females with no wings, and there are a few females with wings. The damaged leaves of the apple were rolled across the leaves. The parthenogenetic reproduction of this worm from spring to autumn, and the drought year when there is intermittent light rain, it is very harmful. In the later period (June-July), a large number of females with winged fetuses appeared, and they were transferred to other plants of this host. From August to September, there was a decrease in the amount of occurrence, until sexual lice emerged after mid-October, and the overwintering eggs were produced after mating. This insect does not have a host-transformation phenomenon and is a stay-type locust.
?? Prevention methods? Should fully understand and use the natural control of natural enemies. In the normal climate, there is no drug interference and the locusts do not cause disaster. When there is a large amount of occurrence, the ladybugs in the wheat field are transferred to the orchard in the middle and early June, and they can also be controlled in the short term. When the damage is severe, when the amount of locust occurrence increases significantly in the middle or early May, 10% of the net (imidacloprid) WP can be used 3 000 to 5 000 times, or 20% more than 8 000 to 10 000 times. Liquid spray, the effect is obvious, can be effective in a short time, knocking force is very strong; can also be used to kill 30% of the eel EC 30%, or 2.5% green enemy kill EC, 2.5% green Kung Fu EC 3 000 ~ 4 1000 times, or 20% of good New Year's Emulsion 3 000 times for spraying, can control its harm. Special attention must be paid to the protection of its natural enemies, such as various ladybugs, hoverflies, grasshoppers, cockroaches, and urchin bees.
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