Control of Spodoptera litura caused by Perilla frutescens

Perilla leaves can disperse surface cold, strong sweating power, used for wind-cold symptoms, see aversion to cold, fever, no sweat and other symptoms, often used with ginger; if the symptoms are both qi stagnation, it can be used with Rhizoma Cyperi, tangerine peel and so on. Perilla leaves in Xingqi width are used for spleen and stomach qi stagnation, chest tightness and vomiting. Originated in China, mainly distributed in India, Myanmar, Japan, North Korea, South Korea, Indonesia and Russia and other countries. There are wild and cultivated species in North, Central, South China, Southwest China and Taiwan Province.

Morphological characteristics of perilla leaves:

Herbs annual, 1-1.5 m tall. Stem quadrangular, erect, purple or greenish purple hairy, much branched. Leaves opposite, long stalked, leaf blade elliptic to broadly ovate, apex protruding or acuminate, margin serrate, both sides purple, pilose. Verticillate inflorescences consist of terminal or axillary racemes inclined to one side; each flower has a bract, ovoid, apex acuminate; calyx campanulate, apex 5-lobed; Corolla 2-lipped, purplish red or pink; stamens 4, 2 strong: ovary 4-lobed, stigma 2-lobed. Nutlets are subglobose and gray-colored. The florescence is from June to July and the fruiting period is from July to September.

Varieties and varieties of perilla leaves

Perilla leaf commodities are often divided into two types according to different character sources:

Red perilla: also known as Perilla leaf, is a cultivated product and is the mainstream of the commodity. Its leaves are wrinkled and often broken, and the intact leaves are oval, long-diameter 5~12cm, wide-diameter 4~8.5cm, leaf apex acute, margin serrated, base broadly cuneate, petiole. The leaves are purple on both sides or green on the upper surface, purple or purplish red on the lower surface, and the leaves are covered with gray-white thin hairs, brittle, fragrant and slightly pungent.

Perilla frutescens: also known as wild perilla, mostly wild products. It is different from red perilla in that the leaf is smaller, the leaf shape is acuminate, both sides of the leaf are green or gray-green, covered with gray-white hair, slightly, but with the smell of grass.

Control of Spodoptera litura caused by Perilla frutescens

The damage and habits of Perilla pest Spodoptera litura:

The first instar larvae clustered on the back of the tender leaves to feed on the mesophyll, leaving a layer of epidermis. After the 3rd instar, the larvae droop and disperse, and the amount of eating leaves increases with the age, and the leaves can be bitten into holes or notches; the aged larvae eat the whole leaves, leaving the main vein, and there is more rain in July and August.

Control methods of perilla pest Spodoptera litura:

To master the characteristics of pre-3rd instar larvae and small food intake. You can first use 80% dichlorvos emulsion or crystal trichlorfon 1000 times solution; 20% fenvalerate EC or 2.5% deltamethrin vinegar EC 2500 times, 50 kg per mu.