Scientific use of pesticides on tobacco technology

Select the recommended types of pesticides used

In determining the control object, based on the appropriate pesticides should be used. Different varieties and types of pesticides, their mode of action, mechanisms of toxicity, control object and scope is different, and some can be rid of a variety of diseases or pests, and some can only control a certain kind. When using a pesticide, you must first understand the properties of the pesticide and control object, and then prescribe the right medicine, in order to achieve good control effect. For example, the absorption of pesticides ("aldicarb") through absorption of tobacco plants can play insecticidal effect on sucking pests (aphids) effective natural enemies safe, when used according to the uptake of Pharmacy characteristics determine the appropriate use of methods, commonly used fertilizing. Chinese companies buying and selling of tobacco production since 1999 to regulate the tobacco pesticide use, recommended the use of pesticides on tobacco varieties and the use of methods, and the prohibition against the use of pesticides on tobacco varieties. October 15, 2003 has announced the 2004 tobacco pesticide use recommendations.

To understand the biological characteristics and control object damage rules

Comprehensive grasp of the biological characteristics and control object damage rules for selecting the appropriate pesticide formulations morphology, pesticide use and the best time to provide a scientific basis. Smoke tobacco budworm generations lay eggs in the distribution are very different, in the Huang-Huai tobacco area, the second generation of smoke Green eggs distributed more concentrated, mainly in the front leaves, leaf and stems, while in leaves mostly positive, the eggs for 70% of the total amount of eggs, then use pyrethroids 1500 times or "Souls" 4000 times on the leaves and leaf spray, to receive a good control effect. The third-generation tobacco budworm eggs scattered distribution, and insects of irregular, then spraying should be comprehensive and thoughtful. Daily activity of newly hatched larvae, feeding leaves, 2nd instar larvae before very sensitive to insecticides, it is a good time to prevention. 3 years old, the tobacco budworm lurking in the leaves during the day, the night and early morning feeding on leaves, buds and tender stems, spraying and spraying needs to evening to a corresponding increase in volume in order to achieve better results. From the tobacco budworm infestation biological characteristics and laws of perspective, for the effective control of tobacco budworm infestation, you must focus on prevention and treatment of the second generation, its eradication in the two age ago, economical, and effective. Another example, the tobacco black shank disease is soil-borne diseases, the growing season rainfall or watering raindrops splashing through the water spread germs infect roots and lower portions of the first leaves, liquid sprayer spraying should be used in the lower leaves IRRIGATING or spray. However, the production of tobacco growers often concentrated on the upper leaf spraying, a waste of human and material resources, the control effect is not ideal.

Make full use of control thresholds choose the right timing control

Pest control threshold is to achieve the required degree of chemical control. See Kamada little pest damage on the adoption of chemical control or the tobacco plant pests and diseases more serious degree when water power sprayer spraying practices are undesirable. Generally, aphids indicators for each one hundred aphids reached 500, the tobacco budworm larvae control index number for each one hundred more than 10. For most leaf spot damage, the incidence rate of 5%, you need to chemical control; farming according to virus before transplanting, the rosette stage and the flourishing pre-spraying, can be achieved effectively prevented. From an economic perspective, the individual tobacco plant pests and diseases is a normal phenomenon, as long as the economic threshold is not reached, promoting the use of agricultural practices such as timely removal of individual diseases or artificial tobacco plants catch insects to control pests and diseases. Chemical control aim is both to maximize pest control, but also ensures that control costs at the lowest level, so that the two should be fully coordinated, approach or reach the cost of inputs and benefits of the "golden combination of points."