Prevention and Control of Diseases and insect pests of Asarum

Asarum prefers a cool, moist environment, avoiding bright light and drought. The soil should be loose, fertile and rich in organic matter.

Generally, the seeds are sown at the beginning of July and the seeds are cracked at the beginning of August, and the radicle is exposed in the middle of August. It can reach 4 cm in early September and more than 6 cm in October. The seedlings did not emerge in the same year, and the buds were unearthed after breaking dormancy at a low temperature below 4 ℃ to the next spring when the local temperature rose to about 6 ℃. 8Mel reached the peak seedling stage at 12 ℃. The growth and development of Asarum is very slow, only two cotyledons grow in the second year after sowing, one true leaf only grows in the spring of the third year, there are still five true leaves in the fourth year, or a few of them blossom in the fourth year, and most of them bloom and bear fruit in the fifth and sixth years. The seedlings were unearthed in spring, and the aboveground parts were basically shaped in May, and no new branches and leaves grew in the future, even if the stems and leaves were lost due to diseases, insects or injuries. The rhizome dormates in the ground, forms a small bud in autumn, and pulls out smaller leaves every year after overwintering. Therefore, it is very important to protect the healthy growth of the aboveground parts.

Pest control

The main results are as follows: 1. there are few diseases to control Asarum diseases, and Sclerotinia sclerotiorum is the most serious disease at present, which occurs from early spring to summer every year, causing damage to the whole plant. Prevention and control methods: strengthen field management, do not accumulate water in the border, do not harden, pay attention to ventilation, and adjust the light to 50%, 60%, 60% transmittance. It should be harvested or planted in a timely manner. 50% carbendazim 500-1000 times solution can be used for chemical control. It is found that the diseased plants should be removed thoroughly, sprinkle lime on the disease points or disinfect the soil with 5% formalin.

2. pest control mainly include ground tiger, black caterpillar, locust, Asarum butterfly and so on. Black caterpillar, locust and Asarum butterfly bite the leaves, and in serious cases, most of the leaves are eaten. The ground tiger is the most harmful, biting the buds and cutting off the petiole and rhizome. The ground tiger can be killed with bean cake or wheat bran mixed with trichlorfon as bait, or poisoned with poisonous soil. Other pests can be sprayed with 1 000 times of trichlorfon.