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Bioefficacy of Insecticides on the Immature and Adult Stages of Spiralling Whitefly on Guava

MMH Khan
Department of Entomology, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted to evaluate the bio-efficacy of insecticides for the management of whitefly in Sharupkhati variety of guava at PSTU campus and in the laboratory of the Department of Entomology, PSTU during January to March 2013. Results revealed that the efficacy of test insecticides in decreasing order was Ripcord 10EC @ 0.75 ml/L of water> Karate 2.5EC @ 1.00 ml/L of water> Chita 48EC @ 0.75 ml/L of water> Aktara 25WG @ 5 g/ L of water which were effective in the reduction of 1^st and 2^nd instar nymphal populations of guava whitefly. In case of 3^rd and 4^th instar nymphs, the efficacy of test insecticides in decreasing order was Aktara 25WG @ 5 g/ L of water> Karate 2.5EC @ 1.00 ml/L of water> Chita 48EC @ 1.00 ml/L of water> Ripcord 10EC @ 1.00 ml/L of water for reducing whitefly populations. For the reduction of adult guava whitefly, the efficacy of test insecticides in decreasing order was Chita 48EC @ 1.00ml/l of water> Ripcord 10EC @ 1.00 ml/L of water> Aktara 25WG @ 5 g/ L of water> Karate 2.5EC @ 0.75 ml/L of water. The percent mortality of adult guava whitefly was higher in dipping method of insecticide application in all the treatments except control as compared to spray method.

Keywords: Bioefficacy, Insecticides, Guava, Spiralling whitefly

Location: PSTU campus and in the laboratory of the Department of Entomology, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

Start Date: 00-01-2013

End Date: 00-03-2013

Program Area: Pest Management

Commodity: Insecticide

Objectives:

The present research work has been planned and designed to evaluate the bio-efficacy of insecticides for the management of guava whitefly.

Methodology:

The efficacy of four insecticides, each having two doses along with control were tested against guava whitefly damaging guava plants at PSTU campus and in some selected farmers’ orchard during to January to March 2013. Guava trees infested with whiteflies were selected for administering the treatments. The spray and dipping methods were followed in the application of insecticides. Insecticides were applied on the plant when the pest population build up was enough to cause damage. Eight insecticidal treatments along with an untreated control were used. These are: T1 = Ripcord 10EC @ 1.00 ml/L of water, T2 = Ripcord 10EC @ 0.75 ml/L of water, T3 = Karate 2.5EC @ 1.00 ml/L of water, T4 = Karate 2.5EC @ 0.75 ml/L of water, T5 = Chita 48EC @ 1.00 ml/L of water, T6 = Chita 48EC @ 0.75 ml/L of water, T7 = Aktara 25WG @ 5 g/ L of water, T8 = Aktara 25WG @ 2.5 g/ L of water and T9 = untreated control. Five leaves were randomly collected from each treated tree and each leaf was served as replication. The detached leaves were carefully kept in polythene covers and tied with rubber band to prevent any escape of whiteflies. The polythene covers were brought to laboratory and observations on number of 1^st, 2^nd, 3^rd, 4^th and adult per leaf were recorded under stereo microscope by absolute counts. Some specimens infested with whitefly of the farmers’ orchard were brought to the entomology laboratory for applying insecticides in dipping method. The pretreatment data were taken at one day before application of insecticide. Data on survival and % reduction over control of nymphs and adult of guava whitefly were taken at 24, 48, 72 and 96 hours after treatment. Statistical analysis Data were analyzed statistically after appropriate transformation and the means were separated using DMRT following Gomez and Gomez [12] by computer MSTAT software.

Source of Information: Journal of Entomology and Zoology Studies 2017; 5(5): 380-384 E-ISSN: 2320-7078 P-ISSN: 2349-680

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Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The application of Chita 48EC @ 1.00ml/l of water could be the most effective insecticides in managing this pest followed by Ripcord 10EC @ 1.00 ml/L of water. Aktara 25WG @ 5 g/ L of water was found to be moderately effective against guava whitefly followed by Karate 2.5EC @ 0.75 ml/L of water. The percent mortality of adult guava whitefly was higher in dipping method of insecticide application as compared to spray method.

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