The greenhouse is the most important and most widely used type of protected land in flower cultivation, especially in northern China. It provides good environmental conditions for many flowers. However, due to the high temperature in the greenhouse, high humidity, and insufficient air circulation, pests occur from time to time. Taking the northern greenhouse as an example, there are three major pests: crickets, squirrels, and snails. They have a great negative impact on greenhouse flowers, from roots and stems to leaves and shoots. The author now gives a brief description of their morphological characteristics, living habits, harm status, and prevention and control measures, hoping to help producers. 1. Commonly known as slugs, slugs, terrestrial molluscs. The adult body is about 25 mm in length. The head, trunk, and foot are in three parts. The body is exposed, soft and without shell, pale yellow-brown, two pairs of antennae, the back of the antennae at the top, the body surface secretes many mucus, the foot is smooth, hermaphrodites, general allogeneic fertilization Infertile with multiple fertilization; larvae about 2.5 mm long, shape and adult similar, no vertical line, antennae dark gray; egg was Rosary-like series, oval, translucent. Two generations of a year occur in the year, with larvae or adults in the soil near the root of the flower for the winter, in March of the following year began to move, in April became an adult, mating spawning, eggs about half a month. Wet and wet, dark, more humus place, fear of light, hidden in the daytime under the flower pot, out at night for food and reproduction. Its hunger-resistance is very strong. Adults can live for 1 to 3 years in a suitable environment.å±å®³ From May to June, the most serious hazard. After the flowers in the greenhouse were attacked by locusts, the leaves of the light plants were not engraved or had holes, and the young ones were bitten to affect their growth and development and flowering. There are two main countermeasures for the prevention and control of paralysis: (1) Regularly cleaning up the interior and exterior of the greenhouse, and discovering that the paralysis will follow and kill, especially in April of each year, the intensity of manual trapping should be strengthened. (2) Apply lime powder or sodium pentachlorophenol to the pot. Sodium pentachlorophenol is more toxic and must be used with caution. 2. The female mouse is also known as the watermelon worm or tide worm and belongs to the crustacean animal. The body is about 10 mm long, gray or black back, wide and flat, shiny. Body 13 points, the first thoracic and neck healing. There are two pairs of antennae, one of which is short and inconspicuous. A pair of compound eyes, black, round, slightly protruding. The newly hatched rats were white, with 6 pairs of feet and 7 pairs after a single molting. The generation of rats is happening one year. Like to live in conditions of dampness, intolerance to drought. When a foreign object touches, its body immediately collapses into a spherical shape, and it is suspended in animation. The rat's reproductive ability is relatively strong. If the antennae and limbs are damaged, new tentacles and limbs can be regenerated through the molting. The female rats lurked at the bottom of the pots during the day, and bite the flowers and tender roots from the pelvic floor drainage holes. At night, they hurt the stems of the flowers and caused the stems of the flowers to fester. There are three points in the prevention of rats: (1) Keep the inside of the greenhouse clean, remove weeds and garbage in time. (2) Spray the pelvic floor with 20% cypermethrin 2000 times solution or 25% carbaryl 500 times solution. (3) When severe, 30% of monocrotophos mixture 3000 times can be sprayed on flowerpots, ground and plants. Third, snail land molluscs, shelled. There are four types of snails that cause damage to greenhouse flowers: gray snails, thin ball snails, the same type of snails, and the Chinese snails. Common gray snails. Gray snails have two pairs of tentacles, of which the posterior antennae are relatively long. The top of the antennae has long black eyes. The shells are medium in size, and the shells are firm and oval in shape. The shells are yellow-brown or amber and have dense growth lines and threads. The eggs of the gray snail are spherical, milky and shiny, and the newly hatched larvae and shells are light brown. Grey snails occur one generation a year, with a life expectancy of more than one year. Adults spawn in the soil in the rhizosphere of the flower or in the loose soil below the flowerpot. The living habits of snails are similar to those of earthworms. Snails inhabit the bottom of a flowerpot or other damp places during the day and climb out to the leaves and other places at night. There are sporadic small and small nicks on the victim's blade, and all of them are eaten. Silver traces are left everywhere in the crawl, affecting the photosynthesis and ornamental effect of the flowers. The prevention measures of snails mainly include: (1) Regular inspections and timely killing. (2) Apply 8% clomazone granules or 10% polyacetaldehyde granules (1.5 grams per square meter). (3) Lime powder is applied to the greenhouse and the bottom of the pots.