Diseases and pests of June snow and their control methods

Diseases and prevention methods of June snow

Cuscuta

A climbing herb that parasitizes on the snow lily. Its vines wrap around the trunk and branches of the snow lily, causing strangulations on the entangled branches. The vines of the dodder form suction cups at the strangulations to absorb nutrients from the snow lily branches.

Dodder grows very fast and will continue to branch out, climb the plant, and intertwine with each other, eventually covering the entire plant.

Prevention and treatment methods

For severely damaged plots, deep plowing should be carried out every year. Seeds buried less than 3 cm will not be easy to unearth.

In late spring and early summer, the plants should be inspected and any dodder found should be removed and destroyed along with weeds and affected parts, as well as any bridging shoots and wild plants.

At the peak period of seed germination, spray 1.5% sodium pentachlorophenol and 2% promethazine solution on the soil, and then spray once every 25 days, for a total of 3-4 times, which can effectively prevent the emergence of dodder seedlings.

Pests and control methods of June snow

snails

Snails usually cause serious damage in May and June, when the June snow is about to enter the flowering period, causing damage to the leaves and stems, and then causing the leaves to fall off. The growth of the June snow will weaken, threatening the entire plant.

Prevention and treatment methods

It can be sprayed with 1500 times diluted 58% Fengleiji emulsion. Root rot sometimes occurs. When the disease first occurs, you can use 600-1000 times diluted 12% copper rosinate emulsion, or 800 times diluted 50% root rot agent to irrigate the roots and spray the leaves. Spray (irrigate) once every 3-5 days, and spray (irrigate) 3-4 times in succession.

Scale insects

Scale insects are mealybugs with strong reproductive capacity and can reproduce multiple generations every year. May is the peak breeding period. The disease often occurs on the edges or backs of leaves, but it can also occur on the surface of leaves.

Scale insects use their mouthparts to pierce the leaves and suck the sap from the leaves. If the damage is minor, the leaves will turn yellow and old, affecting the growth of the plant; in severe cases, the leaves will gradually wither and fall off until the entire plant dies.

Prevention and treatment methods

Use 1000 times diluted 40% oxydemeton-methyl, 1000 times diluted 50% DDT, 3000 times diluted 2.5% cypermethrin for spraying for prevention and control, spray once every 7-10 days, and spray 2-3 times continuously.