Application of botanical insecticides

Common chemical agents have different degrees of injury to vegetables and fruits. For example, omethoate should not be used 30 days before harvesting. Malathion is harmful to melons and peaches. There are phytotoxicity, fruits, 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, the prohibition of the use of pesticides in the flowering period of fruit trees and vegetables should be vigorously promoted by plant insecticides. Now the introduction of the botanical insecticides is as follows: (a) Portulaca oleracea is an alternative to purslane. Annual succulent herb. Stems lying supine or obliquely upward, branched from base, terete, up to 30 cm, pale green, often reddish brown, smooth and glabrous. Leaves alternate, sometimes opposite, extremely short, leaf blade hypertrophy, obovate, entire, 1 to 3 cm long, 5 to 14 mm wide, stipules small, dry membranous, bisexual. Purslane 5 times boiled liquid, the pest killing rate of 46.9%. (b) to open up an anamorphic hole, etc. Herbs perennial. The rhizomes are thick and curved, with several stem marks, commonly known as holes, black surfaces, grayish-white cross sections, stems upright, single, 1 to 1.5 meters high. The lower stem leaves are long-stemmed, the base is slightly expanded into sheaths, and large in size. 3 out of 3 pinnate or 2 out of 3 compound leaves, leaf blade ovate, acuminate, terminal leaflets often 3-lobed and pinnately absent, lateral leaves with irregularly thick serrated edges, often with feathery nicks Or shallow cracks, the upper leaves smaller. Use 14 grams of whole grass to 300 milliliters of water and boil for 1 hour. After filtering, spray vegetable worms and kill 57% of insects. (C) Pulsatilla perennial herb. Up to 50 cm in height, the entire plant is densely covered with white pilose, roots conical, and thickly straight. Basal leaves mostly, three out, long-handled, broadly ovate-blade, centrally lobed, stalked, 3-parted, lobes further 2- or 3-parted. Pulsatilla 500 grams of water 5 kg, boiled or soaked for one day, filtered to prevent tigers, aphids and other pests. (d) celandine Alias ​​berberine, heartbroken grass and so on. Herbs perennial. 30~80 cm tall, long rooted, mostly branched, khaki or dark brown, densely fibrous roots, stem erect, much branched, slender white hairy, red and yellow sap in body, leaves alternate, 1~2 back feathery Split, basal leaves 10 to 15 cm long, 5 to 8 pairs of lobule, gradually decreasing from top to bottom, apical lobules broadly obovate, apex obtuse, margin irregularly nicked. (1) Control cabbage Pieris celandine 1.5 kilograms, lime 0.5 kilograms, add water 3 kilograms for 1 hour, made gravy, spray, insecticidal rate of 70%. (2) At the flowering stage, the whole grass is cut, shaded and dried, powdered and sprinkled on the vegetable plots. There are special effects on the earthworms. (3) Dry 800 grams of whole plant, chopped and heated 5 kg of water for 1 to 2 days, effective in controlling aphids and beetles. (five) Agrimony grass alias alias grass and so on. Herbs perennial. Up to 30 to 70 cm, all with white hairs and glandular hairs. The rhizomes were developed with slender fibrous roots and a conical upwardly curved white bud emerged from the tip of the end of autumn. Stems erect, ribbed, upper branches. Odd pinnate compound leaves, alternate, basal leaves, apex acute or long acuminate, base cuneate, margin coarsely serrate. The entire grass is smashed and 21 kg of water is filtered to remove slag and sprayed to control the aphid effect by 70%. In addition to the above plants, plant-based insecticides include wild plants commonly found in the forests of Sophora japonica, Pinellia terriberi, Speranskia sp., Northeastern peppermint, Northeastern gentian, egg-leaf peony, cocklebur, Kochia scoparia, and are abundant in resources. Extensive, easy to use, non-polluting, non-harmful, and worth promoting.

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