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Common insect pests in the Chinese rose
The rose is a flower with more insect pests. Before the prevention and treatment, we must first understand the symptoms of insect pests and understand what kind of insect pests. Second, we must understand the time and the law of the occurrence of these insect pests and achieve the right remedy. Here are the four most common insect pests. Aphid locusts gather on the buds, leaves, and buds of the rose to suck juice. A large number of oily blackish discharges occur. In spring and summer, parthenogenetic reproduction occurs, and in autumn, sexual reproduction is spawned through winter. During early cultivation in the open field, early spring and early summer are frequent. Control methods: When the amount of insects is small, you can spray clean water. When necessary, it can spray 4000 to 500,000 times the 2.5% deltamethrin emulsion or 1500 to 2000 times the 40% omethoate EC. One-thousandth of neutral detergent powder must be added during spraying to improve control efficiency. Pay attention to the protection of natural enemies such as ladybugs, grass bells, and flies. The bollworm Helicoverpa armigera is a pest with very high feeding and harmful effects. It occurs in 3 to 4 generations a year in North China. The first generation larvae are endangered from late June to early July, and the second generation larvae are from late July to 8th. In the first half of the month, the third-generation larvae are endangered in early September. When the temperature reaches 15°C or above, the larvae become eclosion. The larvae have six instars. Their larvae mainly enter the tender buds and flowers. The insects excrete buds outside, and a larva can be released. Harmful to several buds, so that flowers can not be normally open, mostly yellow-green, after 3 to 4 days after the fall off, mature larvae drooping drooping, into the soil phlegm. In the years when there is more rain, cotton bollworms generally do not occur because the environment is not suitable for the life of cotton bollworms. Control methods: When a small amount of hazards, artificial capture of larvae, drug control is best in the 2nd instar larvae did not enter before the buds can be sprayed with bacterial pesticides B. T-emulsion or chemical pesticide 1200 to 200 times 30% of indomethacin EC, 2000 times of 20% chrysophanol, 1200 times of 50% phoxim EC, 5000 times of 2.5% Kungfu EC to kill the newly hatched larvae. Each year, the adult beetles appear from May to June. It is mainly harmful to rose flowers, spawning in the soil, its larvae feeding on the roots of various flowers, going out at dusk, artificial heaping of rotten leaf fertilizer or chicken manure accumulation place is where it likes to spawn, from July to August When the damage is the most serious and the damage is most severe, the flowers can be bitten by incomplete or even eaten, and 2 to 3 adult beetles can be caught in one flower. The best prevention and control method is manual capture. One year old generation of stem bumble bee, with larvae in the injured branches for the winter, in the next year in mid-May the adult feathers go out, hi spawning shoots on the shoots of the year, especially from the ground issued by the tender shoots, damage After the branches first wilted, they dried up, bent downwards, and finally drilled into the underground part of the branches in the fall, and some drilled into the thicker branches of the previous year for the winter. Control methods: Weak young shoots are found in spring and are cut off at any time to eliminate the larvae inside. In the winter, the branches with insects must be completely exterminated, and the branches with insects must be cut off to eliminate the larvae inside. Pay attention to protecting natural enemies such as parasitic bees. (Source: China Flower Network Dong Ruyi)