The insecticide rotenone is essential in agricultural production. So, do farmers’ friends clearly understand its characteristics and use methods to facilitate its use? The following small series for everyone to explain in detail:
The active ingredient rotenone, commonly known as rotenone, Omega, Shilv, and Green. The main content and dosage form 2.5% emulsifiable concentrate, 7.5% emulsifiable concentrate.
Physical and chemical properties Rotenone is extracted from a variety of plant roots. The pure product is colorless orthorhombic LDs0132r15005～166°C, soluble in acetone, chloroform, acetic acid, ethyl ester, carbon disulfide, insoluble in carbon tetrachloride, ether. Petroleum ether, alcohol, etc., insoluble in water. In the case of racemization in the presence of alkali, it is easily oxidized, especially in the presence of light or alkali, and loses insecticidal activity, and is relatively stable in the case of drying. It is moderately toxic, and the acute oral LD50 of the original drug is 132-1500 mg/kg.
Product Features Rotenone is a kind of plant insecticide widely found in the root bark of plants. It has strong contact and stomach toxicity to insects, especially cabbage caterpillars, diamondback moth larvae and aphids. After entering the worm, the insects die by inhibiting the activity of c-glutamate dehydrogenase and affecting the respiration of insects. It is selective, non-systemic, easy to decompose, easy to oxidize in the air, short-lasting period, no pollution to the environment and safe for natural enemies. In addition to being used as agricultural insecticides, it can also be used as a sanitary insecticide to control human and animal ectoparasites.
Rotenone can be mixed with matrine ingredients such as matrine, trichlorfon, fenvalerate, bio-pesticide avermectin and phoxim to produce compound insecticides.
Applicable crops and control objects Rotenone is mainly used in cruciferous vegetables, leafy vegetables, tomatoes and Other vegetable crops, and has good control effects against aphids, cabbage caterpillars, diamondback moths and other pests.
The use of technical leafy vegetables, cruciferous vegetables and other vegetables, aphids and aphids, from the initial stage to the pre-production of spray control, 7 days or so, even spray 2 times. Use 2.5% emulsifiable concentrate 100-150 ml per 667 square meters, or 7.5% emulsifiable concentrate 35-50 ml, and spray evenly with 40-60 kg of water.
Pieris rapae, Plutella xylostella, etc. are sprayed and controlled during the egg hatching period to the younger larval stage (2 to 3 years old), once every 7 days, and even sprayed twice. The amount of pesticide is the same as “vegetable aphids”.
It should be noted during use that rotenone cannot be mixed with alkaline pesticides. The preparation is flammable and irritating. It is easy to precipitate and crystallize at low temperature. It is easy to deteriorate above 80 °C. In case of light, air, water and alkaline substances, it will accelerate oxidation and fail. It should be stored in a cool, dry and ventilated place. It can produce highly toxic phosgene when in contact with an open flame or a hot object. For livestock, fish and silkworm sorghum, avoid spraying the liquid to nearby pools and mulberry trees. The security interval is 3 days. Tips for pesticide manufacturers : Rotenone has a stimulating effect on eyes and skin. Pay attention to safe medication. If you take poisoning, you can not induce vomiting, and immediately send it to the hospital for symptomatic treatment. There is no special antidote.

Tapping Screws

1.Application scope: Used for threaded joints between thin metal (aluminum, copper) parts and thicker metal parts (main body), wood panels, wall surfaces, etc.. Must be used with the corresponding specifications, slot type Screw spigot with.
2. Reference standard
Pan head cross slot GB845, ISO7049
Countersunk head cross slot GB846, ISO7050
Umbrella head cross slot GB847, ISO7051
Japanese JISB1125 and American ANSI/ASME B18.6.4 have various head types.
3. head type: the same as the head type of self-tapping nails. New and old national standards have three head types: the old national standard for round head (R), countersunk head (F) and half countersunk head (O), the new national standard has a pan head (P), countersunk head (F) and half countersunk head (O). American machine Screws have a variety of head types, in addition to the commonly used pan head, countersunk head, half countersunk head in addition to large flat head, hexagonal Washer head, Warwick head, etc.
(3), tooth type: generally common A teeth and AB teeth. The new version of the IFI standard has been eliminated A tooth products, but due to market needs, some companies are also producing A tooth products, more domestic with A tooth. A tooth AB tooth products are mainly different in the number of teeth, generally speaking, A tooth for coarse teeth, AB tooth for fine teeth, but A tooth and AB tooth products also have differences in tooth outside diameter and head diameter size.

Self Tapping Screws ,Self Tapping Metal Screws ,Self Tapping Bolts ,Stainless Steel Self Tapping Screws

Kunshan Zhonggu Precision Hardware Co., Ltd. , https://www.zgfastener.com