Microbial pesticides are developing relatively fast in biopesticide . In the cultivation process of crops, more and more attention is paid. In order to improve the use of microbial living organisms, the Chinese Pesticide Network Xiaobian introduces you to beware of misunderstandings during its application:
Misunderstanding 1: The temperature is too low when applied. Some farmers do not pay attention to environmental factors when applying microbial live pesticides, do not choose to apply under high temperature weather conditions, even in winter and early spring cold weather conditions, so the expected control effect is not achieved. This is because higher temperatures are required for the application of biological pesticides. Tests have shown that between 25 ° C and 30 ° C, the effect of microbial live pesticide control after spraying is 1 to 2 times higher than that between 10 ° C and 15 ° C.
Myth 2: Apply in dry weather. If the application is carried out under high temperature and dry weather conditions from 10:00 am to 4:00 pm on sunny days, the farmers report that the effect is not good. This is mainly due to insufficient ambient humidity. Such as Beauveria bassiana, as a fungal insecticide, the preparation mainly contains white zonabulum spores. After application, it is directly contacted with the worm body, or is eaten into the digestive tract by pests on the use, and the spores germinate under suitable conditions in the worm body. Breeding, producing beauverin, etc., causing the pest to die slowly. The hyphae and conidia on the dead worms are transmitted to other healthy worms by contact or by means of airflow, causing epidemics, causing a large number of individual deaths. According to the China Pesticide Network , Beauveria bassiana falling into the soil can still survive the winter in the soil, and then invade the insect body in the second year, continuing the insecticidal effect, and the aftereffect is obvious. Therefore, it is preferable to apply when the humidity is high, such as after a cloudy day, after a rain, or in the morning.
Misunderstanding 3: Mixed with fungicides. For example, the genus Aspergillus, as a fungal insecticide, is achieved by the action of live spores of O. sinensis. After application, live spores infect aphids and cause death, which can cause continuous infection and cause a large number of deaths. However, as a living fungus, if mixed with an insecticide, they are killed by a bactericide, and naturally lose their insecticidal action.
Myth 4: It was washed away by heavy rain after use. Spores are most afraid of heavy rain, because the rain will wash away the sprayed bacteria. If it is light rain after spraying (5-6 hours later), it will not reduce the effect of the drug, but it will improve the control effect, because the light rain is very beneficial to the spore germination, and the pest will accelerate its death once it is eaten. Therefore, the application time should be determined according to the weather forecast.
Myth 5: Do not avoid the sun. There is no noon application that avoids high temperature and strong sunlight, causing a decrease in efficacy. Microbial live pesticides are most afraid of strong sunlight. The ultraviolet rays in the sun have a lethal killing effect on the spores, and the ultraviolet radiation can also cause deformation and effect on the parasporal crystals. Therefore, it is necessary to use it after 4 o'clock in the afternoon or on a cloudy day, and the effect will be greatly exerted.
The pesticide network reminds everyone to pay attention to the above misunderstandings, so that microbial pesticides can exert better efficacy.
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Ferro Molybdenum composed of molybdenum and iron, generally containing 50 to 60% of molybdenum, are used as alloying additives for steelmaking. Ferro molybdenum is an alloy of molybdenum and iron. Its main use is as a molybdenum addition agent in steelmaking. The addition of molybdenum to the steel allows the steel to have a uniform fine-grained structure and increase the hardenability of the steel, which is beneficial to the elimination of temper brittleness. In high-speed steel, molybdenum can replace a portion of tungsten. Molybdenum is used in combination with other alloying elements to produce stainless steels, heat-resistant steels, acid-resistant steels and tool steels, as well as alloys with special physical properties. Molybdenum added to cast iron can increase its strength and wear resistance.
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