Common chemical agents have different degrees of phytotoxicity to vegetables and fruits. For example, omethoate should not be used 30 days before harvesting. Malathion has phytotoxicity to melons and peaches. There are phytotoxics, fruits and vegetables should not be used 15 days before harvest. Dichlorvos should not be used for a week before fruit trees and vegetables are harvested. Therefore, pesticides should be prohibited in the flowering period of fruit trees and vegetables, and plant insecticides should be vigorously promoted. The plant insecticides are now introduced as follows:
First, purslane
Alias ​​horse teeth and so on. Annual succulent herb. Stems lying flat or obliquely upward, from base branches, cylindrical, up to 30 cm, pale green, often with brownish red on the sun, smooth and hairless. Leaves alternate, sometimes opposite, very short, thick leaves, obovate, entire, 1 to 3 cm long, 5 to 14 mm wide, stipules small, dry membranous, floral. 5 times boiled water of purslane, the insecticidal rate of soybean aphids was 46.9%.
Second, open the hemp
Alien hole roots and so on. Perennial herb. The rhizome is thick and curved, and there are several stem marks on it. It is commonly called a hole. The surface is black, the section is grayish white, the stem is erect, single, and the height is 1 to 1.5 meters. The lower stem leaves have a long handle, and the base is slightly expanded into a sheath. 3 times three-pinnately compound leaves or 2-nose three-leaved compound leaves, small leaves ovate, apically acute, terminal lobes often 3-lobed and pinnately devoid, lateral leaves with irregularly serrate serrated margins, often with pinnate nicks Or lobed, the upper leaves are smaller. Use whole grass 14 grams of water to 300 ml, cook for 1 hour, filter and spray vegetable aphids, the insecticidal effect is 57%.
Third, Pulsatilla
Perennial herb. Up to 50 cm high, the whole plant is densely white, conical and straight. Basal leaves numerous, three-loculed, with long stalks, broadly ovate-lanceolate, sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately septate Pulsatilla 500g plus 5kg of water, boiled or soaked for 1 day, filtered to control tigers, mites and other soft insects.
Fourth, celandine
Alias ​​hawthorn, broken grass and so on. Perennial herb. 30 to 80 cm high, the main root is slender, many branches, khaki or dark brown, dense roots, stems erect, more branched, slender white pilose, red-yellow juice in the body, leaves alternate, 1 to 2 plumes deep Split, basal leaves 10 to 15 cm long, 5-8 pairs of leaflets, gradually from top to bottom, apical leaflets broadly obovate, apex blunt, unequal rims. (1) Control the cabbage caterpillar with 1.5 kg of celandine, 0.5 kg of lime, add 3 kg of water for 1 hour, make concentrated juice, spray, and kill insecticide rate of 70%. (2) Cut the whole grass during the flowering period, dry the shade, pour it into powder, sprinkle it on the vegetable field, and have special effects on the mantle. (3) Dry 800 grams of whole grass, chopped heating water 5 kg soak for 1 to 2 days, effective in controlling aphids and beetles.
Five, dragon grass
Alias ​​cranes and so on. Perennial herb. Up to 30 to 70 cm, all have white long hair and glandular hair. The rhizome is carried out with a slender fibrous root, and a conical upwardly curved white bud is produced from the apex at the end of autumn. Stems erect, ribbed, upper part branches. Odd-pinnate compound leaves, alternate, with basal leaves, apex acute or long acuminate, base cuneate, margin serrate. The whole grass is smashed with water and 21 kg of filtered slag spray to prevent and control the mites to 70%.
In addition to the above-mentioned plants, it can be used as a plant insecticide, and there are wild plants common in the forests such as Duhu, Pinellia, Scutellaria, Northeast Mint, Northeast Gentiana, Ophiopogon, Panax, and Kochia, which are rich in resources and distributed. Wide range, easy to use, no pollution, no phytotoxicity, it is worth promoting.
First, purslane
Alias ​​horse teeth and so on. Annual succulent herb. Stems lying flat or obliquely upward, from base branches, cylindrical, up to 30 cm, pale green, often with brownish red on the sun, smooth and hairless. Leaves alternate, sometimes opposite, very short, thick leaves, obovate, entire, 1 to 3 cm long, 5 to 14 mm wide, stipules small, dry membranous, floral. 5 times boiled water of purslane, the insecticidal rate of soybean aphids was 46.9%.
Second, open the hemp
Alien hole roots and so on. Perennial herb. The rhizome is thick and curved, and there are several stem marks on it. It is commonly called a hole. The surface is black, the section is grayish white, the stem is erect, single, and the height is 1 to 1.5 meters. The lower stem leaves have a long handle, and the base is slightly expanded into a sheath. 3 times three-pinnately compound leaves or 2-nose three-leaved compound leaves, small leaves ovate, apically acute, terminal lobes often 3-lobed and pinnately devoid, lateral leaves with irregularly serrate serrated margins, often with pinnate nicks Or lobed, the upper leaves are smaller. Use whole grass 14 grams of water to 300 ml, cook for 1 hour, filter and spray vegetable aphids, the insecticidal effect is 57%.
Third, Pulsatilla
Perennial herb. Up to 50 cm high, the whole plant is densely white, conical and straight. Basal leaves numerous, three-loculed, with long stalks, broadly ovate-lanceolate, sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately sessately septate Pulsatilla 500g plus 5kg of water, boiled or soaked for 1 day, filtered to control tigers, mites and other soft insects.
Fourth, celandine
Alias ​​hawthorn, broken grass and so on. Perennial herb. 30 to 80 cm high, the main root is slender, many branches, khaki or dark brown, dense roots, stems erect, more branched, slender white pilose, red-yellow juice in the body, leaves alternate, 1 to 2 plumes deep Split, basal leaves 10 to 15 cm long, 5-8 pairs of leaflets, gradually from top to bottom, apical leaflets broadly obovate, apex blunt, unequal rims. (1) Control the cabbage caterpillar with 1.5 kg of celandine, 0.5 kg of lime, add 3 kg of water for 1 hour, make concentrated juice, spray, and kill insecticide rate of 70%. (2) Cut the whole grass during the flowering period, dry the shade, pour it into powder, sprinkle it on the vegetable field, and have special effects on the mantle. (3) Dry 800 grams of whole grass, chopped heating water 5 kg soak for 1 to 2 days, effective in controlling aphids and beetles.
Five, dragon grass
Alias ​​cranes and so on. Perennial herb. Up to 30 to 70 cm, all have white long hair and glandular hair. The rhizome is carried out with a slender fibrous root, and a conical upwardly curved white bud is produced from the apex at the end of autumn. Stems erect, ribbed, upper part branches. Odd-pinnate compound leaves, alternate, with basal leaves, apex acute or long acuminate, base cuneate, margin serrate. The whole grass is smashed with water and 21 kg of filtered slag spray to prevent and control the mites to 70%.
In addition to the above-mentioned plants, it can be used as a plant insecticide, and there are wild plants common in the forests such as Duhu, Pinellia, Scutellaria, Northeast Mint, Northeast Gentiana, Ophiopogon, Panax, and Kochia, which are rich in resources and distributed. Wide range, easy to use, no pollution, no phytotoxicity, it is worth promoting.
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