Prevention and control of diseases and pests of Ophiopogon japonicus

diseases

Black spot: Pathogen is a semi-known fungus in fungi, harmful to leaves. The pathogen overwinters on seedlings and begins to develop in the middle of April. It develops quickly under suitable temperature and humidity and dies in pieces.

Control method: select green leaves, healthy disease-free seedlings; in the early stage of disease, when the dew is not dry, sprinkle 100 kg of plant ash per mu; in rainy season, remove accumulated water in time to reduce the humidity in the field; soak seedlings with 1:1:100 Bordeaux solution or 65% Diammonium wettable powder 800 times solution for 5 minutes or spray on a large area. When the disease is serious in Zhejiang, the aboveground part of the infected plants is cut off and the seedlings are re-extracted.

black spot of Ophiophora japonica

Anthracnose: The pathogen overwinters in conidia and hyphae on soil debris and diseased tissues, and spreads and infects by conidia through air currents and water droplets. The disease is more serious when the plants are cultivated too densely, and the disease is more serious when the rainfall is large or concentrated. Because conidia can enter into the infection, there are many high stages of anthracnose in southern China. At the early stage of disease, yellow to brown round spots appeared on the leaves, and with the gradual expansion of the disease spots, the disease spots developed into semicircular or irregular shapes at the tip of the leaves. The center of the lesion is greenish-white, the edge is reddish, and there is a brown black line in the edge of the reddish lesion. At the later stage of disease, the tissue at the diseased spot may fall off, resulting in concave defects at the natural edge of the leaf, and the whole leaf will fade to orange color in advance from the diseased place to the tip of the diseased leaf. 800 times solution of 80% anthrax and Formex WP was applied continuously for 2-3 times.

Control methods: (1) In winter and early spring, clean up the diseased body in time, cut off the diseased leaves, and disinfect the leaves with 1~2 Baume's stone sulfur mixture or 200 times solution of 18% multi-bacterial copper wettable powder. (2) Prevent over-dense planting of plants and timely thinning of Venus branches for light transmission. (3) From the rainy season, spray 75% Zineb WP 400 times solution or 50% Carbendazim WP 800 times solution or 70% Chlorothalonil WP on leaves every 7-10 days.

Colletotrichum sp.

Root-knot nematode disease: Root-knot nematode can occur all year round in Guangxi. It mainly damages the roots. Control methods: implement rotation, conditional areas can be water-dry rotation, avoid rotation with flue-cured tobacco, Chinese milk vetch, beans, taro, sweet potato, snakegourd, momordica grosvenorii, atractylodes rhizome, salvia miltiorrhiza, belladonna and other crops; select disease-free seedlings, cut old roots; select disease-resistant varieties; soil disinfection.

pest

White grubs, mole crickets, cutworms, insects and other harmful rhizomes. Control methods: rotation with rice, flooding in paddy fields, all can be eliminated in one season; or with pesticides with conventional methods of poisoning.