What pesticides are generally used for pest control in banana cultivation?
What pesticides are generally used for pest control in banana cultivation? Please introduce the application methods and effects of each pesticide. The following pesticides are generally used for pest control in banana cultivation (see below): (1) Derris extract is a botanical insecticide extracted from the roots of derris, with contact and stomach poison action, and is quite effective against aphids and lepidopteran larvae...
What pesticides are generally used for pest control in banana cultivation? Please introduce the application methods and effects of each pesticide
The following pesticides are generally used for pest control in banana cultivation (see below):
(1) Derris extract is a botanical insecticide extracted from the roots of derris, with contact and stomach poison action, and is quite effective against aphids and lepidopteran larvae. It is extremely safe for humans, livestock and crops, and is especially suitable for use on fruit, vegetables, tea and mulberry; the commonly used application is a spray of 2.5% derris extract emulsifiable concentrate at 500-800 times dilution.
(2) Bacillus thuringiensis var. is a variety of Bacillus thuringiensis. This type of insecticidal bacterium is non-toxic to humans, livestock, crops and aquatic crops, has good stability, and can be mixed with other pesticides. This bacterium has varying degrees of pathogenic and toxic effects on more than 150 species of insects, especially lepidopteran insects. After pests eat this type of insecticidal bacterium, they quickly stop feeding, become paralyzed, soften, rot, give off a foul odor and die. The formulations include wettable powder (10 billion viable spores/gram) and emulsion (10 billion viable spores/milliliter), and can be applied by spraying, dusting, toxic soil and other methods; the commonly used dose is 50 grams of bacterial powder per mu. If mixed with pyrethroid pesticides or trichlorfon and other pesticides, it has a clear synergistic effect. However, it must not be mixed with fungicides or systemic organophosphorus insecticides. It works best when applied at temperatures above 30°C, and should be used with caution in silkworm-rearing areas.
(3) Acephate is a low-toxicity systemic insecticide with both stomach poison and contact action, and can kill eggs. It is a slow-acting insecticide; after application the initial effect is slow, becoming significant after 2-3 days, with a strong residual effect. It is suitable for controlling pests with chewing mouthparts or piercing-sucking mouthparts on many crops including agriculture, forestry, fruit and vegetables. It is suitable for controlling many pest mites. The commonly used concentration is a spray of 40% acephate emulsifiable concentrate at 500-1000 times dilution.
(4) Lorsban, also known as chlorpyrifos, is a moderately toxic insecticide with contact, stomach poison and fumigant action. Its residual period on leaves is not long, but its residual period in soil is longer, and it has good control effects on soil-dwelling pests. The commonly used concentration is a spray of 40.7% Lorsban emulsifiable concentrate at 1000-1500 times dilution.
(5) Lannate, also known as methomyl, is a carbamate insecticide with contact, stomach poison and systemic action, and is especially notable for its killing power against certain insect eggs. It acts quickly, decomposes relatively quickly on crops, and has a short residual period. It has very good control effects on diamondback moth, citrus leafminer and leafhoppers, and has a special effect on thrips. The commonly used concentration is a spray of 24% Lannate emulsifiable concentrate at 600-800 times dilution.
(6) Padan, also known as cartap and nereistoxin, is a derivative of nereistoxin, with strong stomach poison action, as well as contact and systemic action and a certain anti-feeding and egg-killing effect. It has a broad insecticidal spectrum and can be widely used to control many pests of grain crops, fruit, vegetables and more. Because Padan's insecticidal mechanism is to block conduction in the insect nervous system, which is completely different from the mechanisms of organophosphorus, organochlorine and carbamate insecticides, it is especially suitable for controlling pests that have developed resistance to these types. Padan has good systemic translocation action, and in addition to spraying, it can also be applied to the root zone. Although Padan is moderately toxic, it is highly toxic to silkworms and fish, and is generally not suitable for use in silkworm-rearing areas and fish-farming areas; seedlings of cruciferous vegetables such as Chinese cabbage and cabbage are sensitive to Padan under high summer temperatures and prone to pesticide damage, so it should not be used on them. The commonly used application is a spray of 50% wettable powder at 800-1000 times dilution.
(7) Dimethoate is a new variety of organonitrogen pesticide developed in China in the 1970s. Its mechanism of action, scope of application and methods of use are broadly the same as those of Padan, but because it is a domestically produced pesticide, it is cheap and sells very well, and has become the largest-tonnage variety in China's current pesticide production. The commonly used application is a spray of 25% dimethoate aqueous solution at 500 times dilution.
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