What is the thread on a leaf? What are the lines on the leaves that are connected one by one?

Leaf miner flies. Leafminers belong to the family Diptera, which mainly feed on plant leaves or petioles by larvae, and the formation of linear or curved coiled irregular insect channels affects plant photosynthesis, resulting in economic losses [1]. It has a licking and sucking mouthparts type, with larvae as the pest plant leaves, the larvae often burrow into the leaf tissue, sneaking on the mesophyll tissue, causing the leaves to show irregular white spots, making the leaves gradually yellow, causing the decomposition of chlorophyll in the leaves, reducing the sugar content in the leaves, and the yellow leaves of the damaged plants fall off when the damage is serious, and even the seedlings die.

Chinese name. Leaf miner flies.

Leaf miner flies burrow into the skin of leaves and feed on the trails.

Leaf miner flies. Foreign name flies

Body length 4-6 mm, grayish-brown. There are hairs below the anterior margin of the male fly, the legs and tibia are grayish-yellow, the tarsal joints are black, and the hind feet have 3 hind manes. The eggs are white, oval, and millimeter in size, and the mature larvae are about millimeters long, wrinkled, and dark yellow.

Pupa, about 5 mm long, oval-shaped, light yellowish-brown at first, reddish-brown later, dark brown before emergence.

The larvae feed mainly on the leaves or petioles of plants, and the formation of linear or curved and coiled irregular insect channels affects plant photosynthesis, resulting in economic losses [1] . It has a licking and sucking mouthparts type, with larvae as the pest plant leaves, the larvae often burrow into the leaf tissue, sneaking on the mesophyll tissue, causing the leaves to show irregular white spots, making the leaves gradually yellow, causing the decomposition of chlorophyll in the leaves, reducing the sugar content in the leaves, and the yellow leaves of the damaged plants fall off when the damage is serious, and even the seedlings die.

Leaf miner flies, commonly known as splint insects, map insects, etc., are a general term for insects in the family Leaf miners.

The veins of the leaf, which are composed of vascular bundles or vascular bundles and the mechanical tissue of the periphery that run through the mesophyll.

This white line snail crawls over the trail left behind.

The insect-like white lines on the leaves are a harmful symptom of leaf miners. Leaf miner flies belong to the family Diptera, adults and larvae can be harmed, and generally occur more in spring and summer. The larvae often burrow into the leaves and eat the mesophyll between the upper and lower epidermis, causing white serpentine passages to appear on the leaves; Adults will suck the sap of leaves, stab the leaves with ovipositors, destroy the chlorophyll of the leaves, and in severe cases, the leaves will turn yellow, fall off, and even die.

It's a kind of dealer parasite!

Traces left by leaf miners.

Vein! But not only the middle one, all those meridians in the leaf are leaf veins.

Leaf miner, a pest from an invasive American organism, lives in the mesophyll interlayer. There are many vegetable melon leaves.

It should be called leaf vein.

Lotus leaf, also known as lotus stem, lotus stem. It is the leaf of the perennial herbaceous water plant lotus of the family Lotus.

Lotus flowers generally grow to a height of 150 cm and extend horizontally to 3 meters. The lotus leaf can reach a maximum diameter of 60 cm, and the lotus flower can reach a maximum diameter of 20 cm.

There are many white lines on the leaves of plants, like insects, which are caused by pests and diseases and leaf miners.

Leaf miner flies, commonly known as splint insects, map insects, etc., are a general term for insects in the family Leaf miners. There are 147 species of divers and 16 species of spotted divers in China, most of which have a high degree of host specialization, and the polyphagous species of the subfamily Phytodivers are the most harmful. There are mainly 4 kinds of leaf miner flies in China's vegetables, such as American spotted loon, South American spotted loon, tomato spotted loon and pea color loon, among which the first three species of spotted loon fly were introduced into China from abroad after 1994 and harmed on vegetables, and when they began to be introduced, the American spotted loon was the main hazard spreading species, and the population of South American spotted loon multiplied rapidly after 2 or 3 years, and gradually became the main alternate damage species with American spotted loon, and tomato spotted loon was a phased harmful species.

The pea color submarine fly is a natural species in China, which belongs to the perennial endangered species of cruciferous vegetables.

Control methods: 1. Timely irrigation, weeds removal, elimination of overwintering and summering insect sources, and reducing the base number of insects. 2. Master the peak period of adult worms, spray pesticides in time to prevent adult worms from laying eggs. Adults mainly lay eggs on the underside of the leaf and should be sprayed on the underside of the leaf.

Or spray the control of larvae when the harm just appears, the larvae should be sprayed 2 3 times in a row, pesticides can be used 40% dimethoate EC 1000 times liquid, 40% oxidized dimethoate EC 1000 2000 times liquid, 50% dichlorvos EC 800 times liquid, 50% dibromophos EC 1500 times liquid, 40% diazine agricultural EC 1000 1500 times liquid.

It is the traces left by the larvae of the leafminer fly (or spotted leafleaf) in the mesophyll tissue, commonly known as the "ghost drawing". It is necessary to use pesticides that kill this insect.

Typical leaf miner flies, which can be sprayed with insecticides.