The harm of red spider to flowers and trees and its control methods

If we do not pay attention to prevention, flowers and trees will often encounter some insect pests in the process of cultivation. Aphids, red spiders and shell insects are the three most common pests that harm flowers and trees, which not only affect the growth of flowers and trees, but also cause damage to branches, leaves and flowers. Xiaobian will introduce the harm and control methods of red spiders to flowers and trees in detail.

Jasmine flower

I. characteristics of hazards

Red spider, also known as short beard mite, mainly harms the leaves and flowers of flowers, and wild elm, sparrow plum and five-needle pine in bonsai are also vulnerable to its harm. When the stem and leaf juice was pierced and sucked, the water content of the injured part was reduced, the chlorosis became white, and the leaf surface showed dense pale spots, curling and yellowing. In severe cases, yellow leaves, scorched leaves, rolled leaves, fallen leaves and death occurred in the plants. At the same time, red spider is also the transmission medium of viral disease.

II. Prevention and control methods

1. Soak the citrus peel with 10 times of water for 24 hours, then spray the plant with filtrate.

2. Fully stir 50 grams of plant ash with 2500 grams of water, soak for 48 hours, filter, add 3 grams of washing powder and spray, spray once a day for 3 days, and then spray for 3 days every week.

3. Use a plate of ignited mosquito-repellent incense, place it in a pot of diseased plants, then tie it tightly with a plastic bag and smoke it for about 1 hour, the adults and eggs can be killed.

4. When a large number of red spiders occur, 20% diclofenac EC can be used to spray alternately 2 times, or 20% methotrexate EC 2000 times alternately.

Control techniques of red spiders in flowers and trees

Flower and tree red spider, also known as short-whisker mite, is a pest that specifically harms flower leaves and flowers. Wild elm, sparrow plum and five-needle pine in bonsai are also vulnerable to the harm of red spiders.

The prevention and control methods are as follows:

(1) soaking citrus peel with water for about 10 times for one day and night, filtering and spraying plants; it can control red spiders and aphids, such as watering flowers, nematodes in the soil can be controlled.

(2) 15 grams of washing powder, 15 milliliters of 20% caustic soda, 7.5 kilograms of water, spray after mixing, and examined after a day or two; the mortality rates of adult mites and nymph mites of red spiders are 94% to 98%.

(3) fully stir 50 grams of plant ash with 2500 grams of water, soak and filter for two days and nights, then add 3 grams of washing powder to mix evenly and spray: once a day for 3 consecutive days, and then spray for 3 days every other week, it can control prickly sucking pests such as aphids, red spiders and shell insects, and maggots can be controlled in the soil.

(4) use a plate of ignited mosquito-repellent incense, place it in a pot of diseased plants, and then tie it tightly with a plastic bag. After smoking for about an hour, both adults and eggs can be killed, which is a good way to save and achieve quick results.

Common pests of flowers and trees and their control methods

Aphids, red spiders and shell insects are the most common pests that harm flowers and trees. They can harm a variety of flowers and trees, such as Milan, jasmine, rose, Michelia, plum blossom, herbaceous flowers such as chrysanthemum, geranium, balsam flower and so on. Aphids are also known as armyworm. Control methods: (1) use 50 grams of fresh chili or dry red wine pepper, add 30-50 grams of water, boil for about half an hour, spray the damaged plants with its filtrate, which has a special effect. (2) 3 grams of washing powder, 100 grams of water, stirred into a solution, sprayed 2 times for 3 times, the prevention and control effect reached 100%. (3) the mixture of wind oil essence and water is made into a liquid of 600 to 800 times, and the insect is carefully sprayed with a sprayer, so that the insect body is stained with potion, and the effect of killing aphids and shell insects is more than 95%, but will not cause drug damage to the plant. (4) the mixture of washing powder, urea and water at the ratio of 1 ∶ 4 ∶ 100can be used to spray plants, which can kill insects and fertilize two birds with one stone. Second, the red spider, also known as the short-whisker mite, harms the leaves and flowers of flowers, and the wild elm, sparrow plum and five-needle pine in bonsai are also vulnerable to the harm of red spiders. Control methods: (1) soak the citrus peel with 10 times water for 24 hours, then spray the plant with filtrate after filtration. (2) fully stir 50 grams of plant ash with 2500 grams of water, soak for 48 hours, filter, add 3 grams of washing powder and spray, spray once a day for 3 days, and then spray for 3 days every week. (3) place a plate of ignited mosquito-repellent incense in a pot of diseased plants, then tie it tightly with a plastic bag for about 1 hour, and both adults and eggs can be killed. Third, the body of the scale insect is wrapped in a layer of horny carapace, so it is difficult to be effective if it is sprayed directly with drugs. Control methods: (1) use liquor to water, the proportion is 1 ∶ 2, when controlling insects, pour through the surface layer of basin soil. (2) after soaking small cotton balls in vinegar with 50 ml of vinegar, the shell insects can be wiped off and killed by gently wiping the damaged stems and leaves with wet cotton balls. This method is convenient and safe, which can not only achieve the purpose of disinfestation, but also make the injured leaves turn green. (3) by gently wiping the diseased branches with alcohol, the scale insects can be removed, even the larvae invisible to the naked eye can be completely killed, and the harm of scale insects is rarely found in the following year. (4) the mother liquor was made from diesel oil, washing powder and water at the ratio of 100 ∶ 6 ∶ 60. At this time, the mother liquor was in the form of milk. After diluting the water or 30% of the solution, the scale insects on Milan, kumquat and cycad were carefully sprayed. After 1 week, most of the scale insects became withered.