Device and method for testing stomach toxicity and contact toxicity of frankliniella occidentalis

Abstract

The invention relates to a device and a method for testing the stomach toxicity and contact toxicity of frankliniella occidentalis. The device comprises a cover (1), a base (2) and a cover gauze element (3) fixedly arranged in the middle of the cover (1); the inner edge of the side wall of the cover (1) or the outer edge of the side wall of the base (2) is provided with a flexible material; the middle of the base (2) is also provided with a base gauze element (8); filter paper (5) is laid on the base gauze element (8). The device has the advantages of simple structure, convenience and quickness in use, low cost and high flexibility, labor efficiency can be obviously improved, labor intensity is lowered, and toxicity testing accuracy is improved. The method disclosed by the invention has a single or combined simultaneous effect on the stomach toxicity and the contact toxicity, and has the characteristics of simpleness in operation, easiness in processing, relatively short period, high accuracy and high detection efficiency.

Description

technical field [0001] The invention belongs to the technical field of insect toxicity measuring device structure and toxicity measuring method, and specifically refers to the technical field of stomach toxicity and contact toxicity measuring device and toxicity measuring method specially used for the insect of western flower thrips. Background technique [0002] Western flower thrips [Frankliniella occidentalis (Pergande)] is an important worldwide pest of vegetables, flowers and other horticultural plants belonging to the genus Thysanoptera. It can cause rust-brown spots on leaves and fruits, and cause commercial loss of fruits. , in addition to directly harming host plants, it may also spread tomato spotted wilt virus and impatiens necrotic spot virus. Currently, chemical control is mainly used for the control of western flower thrips. [0003] The toxicity determination of pesticides is a quantitative representation of toxicity, that is, the degree of toxicity. The purp...

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Problems solved by technology

However, the individuals of Western flower thrips are quite small (body length is 1-2mm), and the process of toxicity determination is likely to cause artificial experimental errors.

[0004] In the prior art, the method of direct spraying is not used for contact killing, because Westernized thrips individuals are between 1 and 2mm, and Westernized thrips are easy to die in an overly humid environment, which cannot explain the effect of insecticides; mainly use two kinds Toxicity determination method: immersion feeding method and gradient drug film method

The immersion feeding method is mainly stomach poisoning, and the gradient coating method is contact killing. However, there are large errors between these two measurement methods and the actual field effects. The indoor toxicity cannot reflect the field experiment results most closely. Stomach poisoning and contact killing always exist at the same time when taking medicine; moreover, the two methods are cumbersome to operate, the feed is not easy to handle, and the measurement period is long, generally about 48 hours, and the contact killing effect during the measurement process is not ideal, and the experimental data has relatively large error, the operation process requires a large labor intensity and time consumption

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