Prevention and control of flower diseases and insect pests in spring

Aphids: also known as honey insects. Many kinds of potted flowers are harmed by aphids, such as peach, rose, elm leaf plum, plum blossom, cherry blossom and so on. Aphids mostly gather on the opposite side of leaves and feed on leaf sap for a living. Because of its fast reproduction speed, with the rise of temperature in early spring, the damaged leaves can not spread leaves normally, and the new shoots can not grow, which will cause leaves to fall off and affect flowering. When it is hot in summer, some aphids fly to other plants, such as vegetables, and then fly back to the trees to lay eggs for the winter. The control methods are as follows: 1000 times 40% dimethoate emulsion can be sprayed before spreading leaves after germination to kill the newly ovalized young aphids, or not to protect ladybugs and other natural enemies to eliminate aphids until the population growth and decline is out of balance. Natural enemies can not control aphids, and then consider medication. When using this method, it is necessary to use the auxiliary method of pinching dead aphids in the team leader.

< 2 > scale insects: there are many species of scale insects, which are harmful to flowers and trees, and they are the most harmful pests. Tortoise shell scale, white lipid, round. Mulberry white scale, white, pointed. Oyster scale, dark brown, long-shaped male and round female. Armor scale, dark brown, round, shaped like armor. Plants vulnerable to shell insects are camellia, pomegranate, oleander, rhododendron, hibiscus, cherry blossom, plum, peach, begonia, rose and so on. The larvae first suck the sap on the leaves to make the leaves green, and when adults, they mostly suck sap on the branches, which seriously weakens the tree potential and affects flowering. The control methods are as follows: squeeze to death by hand or scrape off the pests on the leaves and branches with a knife, spray 1000 times 40% dimethoate emulsion once or twice in the larval stage, with an interval of 7 to 10 days.

< 3 > Red spider: mites. The worm is so small that it is almost indistinguishable to the naked eye. Most of them are aggregated, and the reproduction speed is very fast. There are many vulnerable plants, such as rose, rose, peach, cherry blossom, rhododendron and so on. Insects gather on the back of the leaves to suck sap, which initially makes the leaves green, and finally causes the leaves to fall off and the new shoots to die. In severe cases, the young trees grow weak and even die. The prevention and control methods are as follows: spraying 1000 times 40% dimethoate emulsion or 1000 times ~ 1500 times trichloroacaricidal emulsion in the initial stage. When the summer temperature is high, the breeding field of the insect is fast, and it is often not as good as to control it. It is necessary to spray pesticides early, and 3 ~ 4 times in a row, with an interval of about 7 days, and do not use a single pesticide to avoid drug resistance.

< 4 > nematodes: nematodes harm plant roots and cause abnormal plant development, including orchids, carnations, daffodils, peonies and so on. When pests are light, they are often difficult to detect. When the insect pest is serious, the plant grows badly and blossoms poorly. As there are many kinds of nematodes in the soil, the worms are young and almost invisible to the naked eye, so it is only based on prevention. 20 ~ 30 3% furan granules can be added to each kilogram of planted soil to dissolve and slowly release nematodes to eliminate nematodes.

< 5 > Caterpillars: there are tentorium caterpillars, boat caterpillars and so on. Eating habits are very miscellaneous, almost harmful to all plants, showing fulminant. It is necessary to prevent and cure it as soon as possible. Manual capture can be used and 1000 times 40% dimethoate emulsion can be sprayed if necessary.

< 6 > Underground pests: grubs, namely beetle larvae, white. Ground tiger, green and black. Feed on the root or root neck of a plant in the soil, often causing plant death. The method of prevention and control is to dig it from the entrance of the hole in time.