Alfalfa pests and weeds control
2019-07-20 15:02:39
The early growth of weeds that control weeds is extremely slow and vulnerable to weeds. Artificial control of weeds is labor-intensive, and the effect is not ideal. Currently, weeding is mainly performed through chemical methods.
Types of weeds: There are many weeds that are harmful to the growth of perennial grasshoppers. Some weeds have a certain range of endangering pastures. However, dodder seed is harmful to alfalfa, so it should be controlled.
Chemical control chemical herbicides are divided into two categories according to their effects. One is selective herbicides and the other is herbicides. Selective herbicides only kill grass without damaging pasture and crops. Such as 2,4-D, citrazin, oxyfluorfen, etc.; indiscriminate herbicides, regardless of good and bad, all contact killing, such as diuron, sodium glycyrrhizate sodium pentachlorate and so on. Herbicide spraying 20-30 days before grazing or cutting to avoid poisoning.
Diseases and Insect Pest Control Grasslands, due to diseases, insect pests, and rat damage, will cause a large area of ​​production loss, and the quality of grasses will decline, seriously affecting the normal growth of pasture.
The main diseases of pasture and its main diseases are rust, downy mildew, brown spot and powdery mildew. After occurrence of rust in alfalfa, photosynthesis decreased, respiratory intensity increased; due to multiple rupture of the epidermis, the water transpiration increased, and it was prone to wilting when it was hot; rust caused the leaves of the alfalfa to retreat green, shrink and fall ahead of time. In severe cases, the yield could be reduced by 60 %; plants infected with rust rust contain toxins that not only affect palatability, but also cause poisoning after consumption by livestock and poultry. Can be used mancozeb (0.2 kg / ha), oxidizing wheat rust Ling and chlorothalonil mixture (0.4 - 0.8 kg / ha), 15% triadimefon 1000 times spray, can prevent rust rust.
The main pests of pasture and its control The main pests of alfalfa include leafhoppers, aphids, wheat fly, armyworm, and aphids. The leafhoppers generally occur one or two generations a year. The first generation of larvae occurs from late May to early June, and the insect period ranges from 15 to 28 days. The insects mainly damage the flower base and leaves, but only the veins are serious. , like a network. Can be used 50% diazinon agricultural 150-200 grams per mu, 80% carbaryl wettable powder 100 grams per mu for drug control. Aphids generally occur in more than 20 generations a year and often accumulate in plant stems, buds, tip leaves and young leaves, and flower organs. The sap is sucked by a sucker. Damaged pastures are short, leaf curled due to lack of nutrition. Yellow, severe plant death. For aphids 50% malathion EC, 50% Acacia pine EC, 25% Dimethoprim EC 1000x, and 40% Dimethoate 1000-1500x are used for chemical control (Caution: Use of chemicals After the prevention and cure, no grazing or grazing can be conducted within half a month.
Types of weeds: There are many weeds that are harmful to the growth of perennial grasshoppers. Some weeds have a certain range of endangering pastures. However, dodder seed is harmful to alfalfa, so it should be controlled.
Chemical control chemical herbicides are divided into two categories according to their effects. One is selective herbicides and the other is herbicides. Selective herbicides only kill grass without damaging pasture and crops. Such as 2,4-D, citrazin, oxyfluorfen, etc.; indiscriminate herbicides, regardless of good and bad, all contact killing, such as diuron, sodium glycyrrhizate sodium pentachlorate and so on. Herbicide spraying 20-30 days before grazing or cutting to avoid poisoning.
Diseases and Insect Pest Control Grasslands, due to diseases, insect pests, and rat damage, will cause a large area of ​​production loss, and the quality of grasses will decline, seriously affecting the normal growth of pasture.
The main diseases of pasture and its main diseases are rust, downy mildew, brown spot and powdery mildew. After occurrence of rust in alfalfa, photosynthesis decreased, respiratory intensity increased; due to multiple rupture of the epidermis, the water transpiration increased, and it was prone to wilting when it was hot; rust caused the leaves of the alfalfa to retreat green, shrink and fall ahead of time. In severe cases, the yield could be reduced by 60 %; plants infected with rust rust contain toxins that not only affect palatability, but also cause poisoning after consumption by livestock and poultry. Can be used mancozeb (0.2 kg / ha), oxidizing wheat rust Ling and chlorothalonil mixture (0.4 - 0.8 kg / ha), 15% triadimefon 1000 times spray, can prevent rust rust.
The main pests of pasture and its control The main pests of alfalfa include leafhoppers, aphids, wheat fly, armyworm, and aphids. The leafhoppers generally occur one or two generations a year. The first generation of larvae occurs from late May to early June, and the insect period ranges from 15 to 28 days. The insects mainly damage the flower base and leaves, but only the veins are serious. , like a network. Can be used 50% diazinon agricultural 150-200 grams per mu, 80% carbaryl wettable powder 100 grams per mu for drug control. Aphids generally occur in more than 20 generations a year and often accumulate in plant stems, buds, tip leaves and young leaves, and flower organs. The sap is sucked by a sucker. Damaged pastures are short, leaf curled due to lack of nutrition. Yellow, severe plant death. For aphids 50% malathion EC, 50% Acacia pine EC, 25% Dimethoprim EC 1000x, and 40% Dimethoate 1000-1500x are used for chemical control (Caution: Use of chemicals After the prevention and cure, no grazing or grazing can be conducted within half a month.
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