Leeks as an indispensable vegetable on the table, in recent years, let everyone love and hate, resulting in now mentioning leeks, immediately think of whether they will be poisoned, some people think that leeks are "fed" by pesticides, is "poisonous leeks", resulting in some consumers afraid to eat leeks, dare not eat leeks, lack of confidence in the consumption of leeks. Even to the point of talking about "leek" discoloration.
Why leeks are prone to pesticide residues exceeding the standard
In fact, leeks generally do not have too large pests and diseases, and it is reasonable to say that pesticides are rarely used, but why is it easy for pesticide residues to exceed the standard?
This is because leeks have a deadly natural enemy, that is, maggots, growers call them leek maggots, leeks are the larvae of late-eyed mushroom mosquitoes, are important underground pests of leeks, green onions, garlic vegetables, especially like to eat leeks, mainly with larvae to harm the young stems and bulbs at the base of leeks.
Leek maggots are the most common occurrence of leeks, the most serious harm, the most difficult to control the underground pests, in the past, in order to effectively control the harm of leek maggots, the use of a large number of highly toxic, highly toxic pesticides, such as methion, chlorpyrifos, octyl thion, often cause a large number of pesticide residues, leeks have become a veritable poisonous leek.
In particular, the leeks grown in the anti-seasonal greenhouses, the humidity and temperature are suitable for the harm of leeks, and the growers often take the mode of watering and irrigation in the management process, which makes the humidity in the shed more large, forming a vicious circle for the prevention and control of leeks.
Insect pathogen nematodes keep poisonous leeks from happening
Through the control of leeks by pesticides, conventional insecticides are not satisfactory for their effect and drug resistance, etc., vegetable farmers in some places use a large number of highly toxic insecticides on leeks, so that pesticide residues increase, not only pollute the environment, but also bring threats to people's health.
Therefore, safe and effective biological control measures are needed to control leek maggots. The main problem faced in the pollution-free production of leeks is how to control the harm of leek maggots and control the pesticide residues in leek products without exceeding the standard.
With the continuous improvement of people's understanding of pesticide residues and environmental protection, scientific researchers have been constantly exploring the use of biotechnology to control leek maggots. After years of successful experiments, this is the new technology of insect pathogen nematode control leek maggots.
Insect pathogen nematodes are a class of nematodes of obligate parasitic insects, safe to use, non-polluting to the environment, harmless to humans, can be mixed with pesticides, can actively search for hosts, and are natural enemies of a variety of underground pests.
Insect pathogen nematodes enter the pest through the mouth, body wall or anus of the pest, and after entering the pest, the insect pathogen nematode releases commensal bacteria, and the symbiotic bacteria secrete toxins to destroy the physiological defense function of the insect, so that the insect dies within 24-48 hours of sepsis.
At the same time, insect pathogen nematodes and symbiotic bacteria jointly consume the nutrients in the pest's body for their own reproduction, until the pest's influence substance is consumed, and the larva crawls out of the insect body during the infection period and continues to look for the host insect, thus forming a sustainable control of the insect pathogen nematode.