Prevention and Control of Diseases and pests of Lotus Seeds

Lotus has strong adaptability and can resist general diseases and insect pests, but if there are more diseases and insect pests, it will affect the growth and development of lotus.

Disease

Rot (root rot): black-brown spots occur on the leaves at the initial stage, then gradually expand, and finally cause rot, followed by petiole, lotus root nodes, and rhizomes. Prevention and control methods: 800 times of topiramate or 65% of 600 times of Dysen zinc can be sprayed, and diseased leaves should be removed and burned to keep the water quality clean and continuous cropping of flood and drought.

Black spot: irregular brown disease spots appear on the leaf surface in the early stage, with slight wheel lines, and black mildew appears on the disease spots in the later stage, often several disease spots are linked together to form large disease spots, and in severe cases, the whole plant dies. Prevention and control methods: spray 50% carbendazim or 75% chlorothalonil 500 times 800 times in time at the initial stage of the disease.

Insect pest

Large coir moth: also known as bag worm, larvae hatched in mid-June, crawling on nearby branches and leaves, spreading to lotus leaves with the Phoenix, spinning to make bags, biting and spitting leaves adhering to the outside of the bag, crawling with bags, sticking out their heads to eat lotus leaves and bud stalks, and in serious cases, they can eat up the lotus leaves. Control method: 1500-2000 times liquid of trichlorfon and 800 times liquid of green chrysanthemum were sprayed to get the best control effect before the second instar in early July.

Rhopalosiphum aphids: damage caused by nymphs or adults gathering on leaf buds, leaf backs and flower buds of floating and standing leaves. Mainly occurred in May-September, prevention and control methods: 40% dimethoate emulsion 2000-2500 times liquid or 2.5% rotenin 500 times spray.

Copper green beetle: adults fly to the lotus leaves to bite at night, and the damage is the most severe in summer. Prevention and control methods: can make use of its phototaxis and false death, set up light trapping and artificial killing, or spray and kill with 1500-2000 times of trichlorfon.

Yellow diamondback moth: the larvae are harmful to lotus leaves, and the stinging hairs of the larvae are poisonous. After touching the skin, they can immediately cause severe pain of redness and swelling. They can be sprayed with 1000-1500 times of trichlorfon and 800x of cyanobacteria, and the insect leaves can be removed to eliminate the overwintering cocoons attached to the branches and trunks around the lotus.

Spodoptera litura: newly hatched larvae gather the leaves to gnaw on the back of the mesophyll, leaving behind the epidermis and veins. The injured leaves are gray and white like screen windows. When the larvae are a little older, they disperse the food damage, bite the leaves into niches, and can bite buds and flowers, and the damage is the heaviest from June to October every year. Prevention and cure

Methods: the insect leaves were removed and destroyed in time, and when the larvae were damaged, 1000 times solution of methamidophos was sprayed in the evening.

Rice root leaf beetle: the larvae are water maggots, sucking the juice of stems, leaves and stems, causing lotus leaves to turn yellow and can be killed with lime.