A granule virus dry suspending agent and a preparing method thereof

Abstract

The invention relates to the technical field of biopesticides, and particularly relates to a granule virus dry suspending agent and a preparing method thereof. The dry suspending agent is mainly prepared by subjecting a granule virus aqueous suspending agent to pressurized spray drying and fluid-bed granulation, wherein a hot-wind inlet temperature of spray drying is 130-150 DEG C, an outlet temperature is 70-90 DEG C, and the temperature of a fluid bed is 50-70 DGE C. The granule virus aqueous suspending agent comprises a spray drying protective agent. Through setting temperature parameters of spray drying, and combining the spray drying protective agent added into the granule virus aqueous suspending agent, preparation of the dry suspending agent by adopting a spray drying wet-method granulation process is achieved, defects of dry-method granulation are overcome, the prepared dry suspending agent has high pest killing activity, good suspension, dispersing and disintegration properties, the suspending rate of the dry suspending agent is greater than 85%, dispersibility of the dry suspending agent is greater than 85%, the dry suspending agent has loose granules and is easy to disintegrate, and killing toxicity for corresponding pests can be 90% or above.

Description

technical field [0001] The invention relates to the technical field of biopesticides, in particular to a granular virus dry suspension and a preparation method thereof. Background technique [0002] Lepidoptera pests such as diamondback moth, cabbage caterpillar and codling moth are the main pests of fruits and vegetables. At present, there are many control methods for these pests, such as agricultural control, physical control, chemical control and so on. Chemical control is still one of the main methods. For example, for the prevention and control of diamondback moth, there are methamectin emamectin, chlorpyrifos, chlorantraniliprole, beta-cypermethrin, abamectin, BT, etc. on the domestic and foreign markets. However, in actual production, due to the continuous, frequent, and high-dose use of some traditional chemical agents, the problem of pest resistance is becoming more and more serious, and the control results are also deteriorating. Lost edible value, caused irrepar...

AI Technical Summary

Problems solved by technology

Because microbial viruses are more sensitive to temperature, there is often a defect of inactivating the virus during the spray drying process. Therefore, there is no microbial virus pesticide that is granulated into a dry suspension by pressurized spray drying. For example, Chinese patent CN101278680A discloses A water-dispersible granule dosage form insect baculovirus insecticide is prepared, and the dry suspension dosage form insect baculovirus insecticide is prepared by dry kneading and granulation; as Chinese patent CN101828574A discloses a recombinant beet armyworm nucleus The polyhedrosis virus preparation is prepared by drying the virus stock solution at low temperature, crushing it, and then directly mixing it with the preparation to prepare a virus preparation. This low-temperature drying method has high energy consumption and cost, and is not suitable for industrial application

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