The common pests of vegetables include aphids, whitefly, beet armyworm, etc. According to the characteristics of different pests, how to choose the right medicine? Let's follow the small series to understand.
1. Control vegetable aphids. Imidacloprid, recommended dose of 1-2 grams of active ingredient / acre; acetamiprid, recommended dose of 0.45 -0.6 grams of active ingredient / acre; pymetrozine, 5 grams of active ingredient; pyrethrin, active ingredient 1.8 grams; bitter Alkali, the active ingredient is 0.4 g; chlorothiazide, the active ingredient is 2 g. Spray at the beginning of the locust.
2, prevention and control of vegetable tobacco powder. Imidacloprid, the recommended dosage is 2 grams of active ingredient per mu; bifenthrin, the recommended dosage is 0.75 grams of active ingredient per mu. Spray application at the beginning of the season.
Acetamidine, active ingredient 2.5 g / mu (for example, 3% acetamiprid emulsifiable concentrate 83 ml / mu); thiamethoxam, active ingredient 4 g / mu (for example, 25% thiamethoxam water dispersible granules 16 g / mu) . Spray application at the nymphal initiation period.
3. Prevention and control of beet armyworms. Bipropiononitrile, the recommended dosage is 5g active ingredient/mu; furose hydrazide, the recommended dosage is 6g active ingredient/mu; indoxacarb, the recommended dosage is 2.4g active ingredient/mu; Ingredients 2.5 -3.5 g / mu (for example, 5% hexaflumuron EC 50-70 ml / mu); chlorpyrifos active ingredient 20 - 24 g / mu (for example, 40% chlorpyrifos EC 50-60 ml / mu); methylamino The avermectin has an active ingredient of 0.3-0.5 g/mu (for example, 1% carbaryl avermectin emulsifiable concentrate 30-40 ml/mu), and sprays 50 kg of water once. It is recommended to spray at the young age of beet armyworm (before the larva 2 years old).
Tebufenozide + chlorpyrifos, active ingredient 24 g (4 g of tebufenozide + 20 g of chlorpyrifos); flubendiamide, 3 g of active ingredient, at the beginning of the beet armyworm, most larvae are even below 2 years old spray.
4. Prevention and control of the diamondback moth. Emamectin, the recommended dosage is 0.15-0.25g active ingredient/mu; fipronil, the recommended dosage is 1-2g active ingredient/mu; chlorfenapyr, the recommended dosage is 3.35-5g effective Ingredients/mu; indoxacarb, recommended dosage is 3g active ingredient/mu; chlorfenapyr, active ingredient 5-6g/mu (eg 10% chlorfenapyr suspension 50-60g/mu), water 50 liters of spray once; flubendiamide, 3 grams of active ingredient. Sprayed on the larvae of the second instar larvae during the hatching period of Plutella xylostella.
5, prevention and control. The active ingredient of chlorpyrifos is 160g. It is diluted in water and evenly poured on the roots of leeks. The active ingredient of diazinon is 400g. It will be granules in the initial symptoms of leeks. Mix the soil, mix it and apply it, and pour the water after application to ensure the efficacy. 30 mg of the active ingredient of chlorfenapyr; 480 g of active ingredient of phoxim. When the symptoms of the leek are initial, dilute the water and evenly pour it on the roots of the leek.
More pesticide knowledge , please pay attention to China Pesticide Network
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Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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