Cucurbitine, the trade name is insect enemy, guard bird, Saiwan Ding, Xihuading, good comet, and it is a plant-derived insecticide extracted from certain lily plants. It is a variety of alkaloids. Mixture. The preparation is a grass green or brown transparent liquid. The cucurbitacin preparation is extracted from the seeds of squid and the rhizome of white squash, and has insect contact and stomach toxicity to insects. The main preparations are 0.5% cucurbitacin solution, 0.5% soluble liquid agent, 1.8% water agent and 5%~20% powder.
The main insecticidal mechanism is that after the pesticide enters the digestive system through the epidermis or sucking into the digestive system, it causes local irritation, causing reflexive insects to excite, first inhibiting the sensory nerve endings of the insect body, and then inhibiting the central nervous system and causing the pest to die. The cucurbitacin has low toxicity to humans and animals, low residue, no pollution to the environment, and the efficacy lasts for more than 10 days, which is longer than that of rotenone and pyrethrum. It is highly effective for the control of vegetable pests.
Application in vegetable production 1. Prevention and control of aphids in the early stage of aphids in different vegetables, using 0.5% alcohol solution 400~600 times liquid spray once, the effective period can reach more than 2 weeks. Other insecticides with the same effect can be sprayed again to achieve the effect of high efficiency and delay of resistance.
2. Control of cabbage caterpillar When the cabbage is in the rosette stage or the cabbage caterpillar is in the low-age larva stage for the appropriate application period, it can be sprayed once with 0.5~500 times alcohol solution 500~800 times, and the effect period can reach 2 weeks.
3. The control of cotton bollworm is applied at the peak of hatching of cotton bollworm, and sprayed with 0.5% soluble liquid 800~1000 times.
4. Control leaf roller moths spray with 500~800 times of 0.5% alcohol solution.
Precautions are best applied during the pest larval stage. For example, the cotton bollworm has a higher mortality rate in the 1st to 3rd instar larvae, while the 4th instar use is less effective, so it should be used in the younger stage of the cotton bollworm. Do not mix with strong acid or alkaline preparations. The cucurbitacin should be sprayed separately and shaken well before use, otherwise the effect may be reduced. Tips for China Pesticide Network : The insecticide is easily photolyzed and should be stored in a cool dry place.
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