Common diseases and insect pests of magnolia and their control techniques, orchid planting, fresh-keeping, storage and transportation

Fried cicada

The nymph of the fried cicada sucks the root juice of the flowers in the soil, the adults suck the juice of the main leaves, and the female inserts the ovipositor on the branches to lay eggs, causing the branches to die.

Control method: ① kills the newly unearthed mature nymph in time. If the occurrence of ② is serious, it can light a fire near the tree trunk on a hot summer night, shake the branches, burn the cicadas and kill the cicadas that fall outside the fire. ③ uses sticky tung oil or a sticky ball kneaded by cobwebs to stick to the end of the bamboo pole to catch adults. ④ inspected and cut off the spawning branches in time from April to August.

two。 Red wax scale

The nymphs and adults of the red wax scale suck the flower juice, and their feces often induce the occurrence of coal fouling disease, so that a layer of black mold or thick black film is formed on the leaves, the whole plant becomes a black tree, and the plant is weak, rarely blooming or unable to bloom at all.

Control methods: ① winter and early spring, combined with pruning to remove some insect branches. ② can be scraped artificially in winter and spring if there are few or shorter flowers and plants. During the peak incubation period of nymphs, ③ sprayed 1000 times of 25% imidophos EC or 1500 times of 40% omethoate EC, once every 4 to 6 days, three times in a row. When ④ introduces flower seedlings, strict quarantine should be carried out to prevent insects from being brought into the plant.

3. Blown cotton scale

Prevention and cure method: ① artificial prevention and cure. Pinch off female worms and oocysts with hands or tweezers, or cut off multi-worm branches and leaves. ② biological control. Attract and release natural enemies such as big red ladybug and Australian ladybug to prey on cotton scale. Drug prevention and treatment. During the transfer period of newly hatched nymphs, 40% omethoate 1000 times, or 50% fenitrothion 1000 times, or ordinary washing powder 400 times 600 times, was sprayed every 2 weeks for 3 times.

4. Red spider

Control method: ① was soaked in citrus peel with 10 times water for one day and night, filtered and sprayed with plants. ② washing powder 15g, 20% caustic soda 15ml, water 7.5kg, mix well and spray the plant. ③ 50g plant ash, fully stirred with 2.5kg water, soaked and filtered for two days and nights, then mixed with 3G detergent and sprayed evenly, once a day, three times in a row, and three more times after a week, can eliminate the second generation pests and put them into the soil to control maggots. ④ lit a plate of mosquito-repellent incense, placed it in a pot of diseased plants, and then tied it tightly with a plastic bag. After an hour of smoking, it could kill eggs and adults.