SU1718765A1 - Method for struggling with malarial mosquitos - Google Patents

Abstract

The invention relates to medicine, in particular to biological methods of combating mosquitoes, vectors of human and animal diseases. The aim of the invention is to enhance the efficiency of the method in reservoirs with a high thermal regime and covered with aquatic vegetation. For this purpose, fry of commercially harvested body fish are used in the amount of 4-5 copies per 1 m2. The method allows halving the number of mosquito larvae in reservoirs overgrown with aquatic vegetation. 2 tab.

Description

The invention relates to medicine, in particular to biological methods of controlling mosquitoes, vectors of human and animal diseases.

There is a known method of combating malic mosquitoes, including the use of white carp fry as a larvifag. The method consists in obtaining fry in a factory manner, settling them in spring in reservoirs or rice fields, an autumn catch for the purpose of selling planting material or transplanting into wintering ponds. During the entire period of rearing from May to September, in reservoirs inhabited by young at the rate of 5 specimens per 1 m, mosquito larvae are usually absent or single specimens are found.

The disadvantage of this method is the impossibility of using fish of this species in thermal ponds. In addition, grass carp is slow in growth, therefore it reaches marketable products only in the second year.

The purpose of the invention is to enhance the efficiency of the method in reservoirs with a high thermal regime and covered with aquatic vegetation.

This goal is achieved by settling water bodies with a high thermal regime in May by fry of body pals at the rate of 4-5 copies per 1 m2. Such a norm of planting ensures a high efficacy of the destruction of mosquito larvae, and in September, this young reach commercial production and are realized.

The results of the efficiency of the destruction of the larvae of small mosquitoes with different density of fish landing are presented in Table 1.

As can be seen from Table 1, the most effective is the colonization of bodies of water by drinking in an amount of from 4 to 5 copies. Reduced planting density fry

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Vi x ate

leads to a decrease in the efficiency of eating larvae up to 60%. Increasing the density of landing fish leads to an increase in feed consumption.

The results of the efficiency of the destruction of larvae of small mosquitoes by fish with different coverage of the water surface with vegetation are presented in Table 2.

As can be seen from Table 2, in experiments with white Amur, the efficacy of eating small mosquitoes was characterized by a decrease from the open water surface to the half-open and especially covered. Then, in experiments with bodies, performance indicators in similar experiments were high. In this way; The high efficiency of eating mosquitoes in all experiments ensures its reliability in the biological method.

During the entire period of growing from May to September, in reservoirs populated by young tel pies at a rate of 5 copies / m2, fish productivity is 200 kg per m3, the realization of which fully pays for its use as larvifagov.

Thus, thermophilicity, a high degree of larvifagia, and the achievement of marketable products in the first year favorably distinguishes the body from the known method, which makes it possible to recommend it as larvifagov for the destruction of mosquito larvae in thermal reservoirs.

Using the method as a larvifag in reservoirs with a high thermal regime will expand the scope of practical application of the biological method of mosquito control, eliminate the use of insecticides and their pollution of the environment, annually obtain marketable products and fully recoup the costs of using these larvifages.

F o rm u l a i z o b r i u The method of combating malic mosquitoes, including the use of commercial fish, characterized in that, in order to enhance the efficiency of the method in reservoirs with a high thermal regime and covered with aquatic vegetation, commercial fish use tel pius in an amount of 4–5 specimens per square meter.

Table 1

table 2

Claims (1)

Claim A method of combating malaria mosquitoes, including the use of commercial fish, characterized in that, in order to enhance the effectiveness of the method in bodies of water with high thermal conditions and covered with aquatic vegetation, telapia is used as commercial fish in an amount of 4-5 copies per 1 m ² . Table 1 Kind of fish Density of planting, instance / m ² The efficiency of eating,% White amur 3 66.5 4 73.3 4,5 76.0 5 82,2 Telapia 3 60.0 4 75.8 4,5 79.3 5 86.7 table 2 Kind of fish The efficiency of the destruction of mosquito larvae,% Open surface Half open surface Coated surface White amur 98.6 83.8 34.3 Telapia 97.1 83.3 76.3