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Effectiveness of Three Insecticides in Controlling Guava Whitefly, Aleurodicus Dispersus Russell Under Laboratory Condition

R. Afroje
Department of Entomology, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

M. M. H. Khan
Department of Entomology, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

M. A. Rahman
Department of Entomology, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

Abstract/ Executive Summary:

Study was carried out in the laboratory of the Department of Entomology at Patuakhali Science and Technology University, Dumki, Patuakhali during September to October 2013 to evaluate the effectiveness of insecticides e.g., Fighter 2.5EC, Chita 48EC and Superior 505EC with three doses of each for controlling guava whitefly. Results revealed that significantly the highest percent reduction of nymph and adult population was found when spraying Superior 505 EC @ 1.00 ml/l of water at 24, 48 and 72 hour after treatment (HAT). Among three tested insecticides, the lowest percent reduction of nymphal and adult population of guava whitefly per leaf was recorded in the leaf treated with Chita 48 EC @ 0.50 ml/l of water at 24, 48 and 72 HAT. No reduction of whitefly population was found in untreated control. However, the level of effectiveness of the tested insecticides in descending order was: superior>fighter>chita. Therefore, Superior 505 EC @ 1.00 ml/l of water may be tested at field level to see its effectivity in controlling this pest.

Keywords: Effectiveness, Guava whitefly, Insecticide

Location: Department of Entomology at Patuakhali Science and Technology University, Dumki, Patuakhali

Start Date: 00-09-2013

End Date: 00-10-2013

Program Area: Pest Management

Commodity: Insecticide, Fly, Guava

Objectives:

The aim of the present study was to evaluate the effectiveness of some insecticides for the management of guava whitefly under laboratory condition.

Methodology:

A laboratory study was conducted to assess the effectiveness of three insecticides (Superior 505 EC, Chita 48 EC, Fighter 2.5 EC) with three recommended doses (@ 1 ml /l of water, along with 0.75 ml/l of water and 0.50 ml/l of water) with an untreated control against nymph, pupa and adult stages of guava whitefly in the laboratory of the Department of Entomology, Patuakhali Science and Technology University, Dumki during September to October 2013. Nymph, pupae and adults of the pest were collected from the severely infested guava plants. The guava leaves infested by different stages were collected. Two field collected leaves each containing 10-20 fresh adult or other stages were kept on the water soaked filter paper in a Petri dish (150 cm dia), which constituted single replication. Each treatment including untreated one was replicated thrice. The different stages of the pest were recorded using 10x magnifying glass and under stereoscopic micorscpoe. The leaf with pest individuals was dipped for two seconds in the insecticidal solution prepared by mixing at the rate of 1 ml /l of water, 0.75 ml/l of water and 0.50 ml/l of water for each of Superior 505 EC, Chita 48 EC and Fighter 2.5 EC. Treated leaves with nymphs were dried for 30 minutes and adults for 5 minutes at ambient temperature. The control leaf was dipped in water only. The number of nymphs and adult survived on the leaf was recorded by absolute count using 10 x magnifying glasses. Pretreatment data = data which were recorded before application of any treatment. Mortality of 1^st and 2^nd instars were recorded at 24 and 48 hours after treatment and 3^rd and 4^th instar nymphs were recorded 2 days after treatment. For counting adult mortality at 24, 48 and 96 hours of treatment on leaves was recorded. Statistical Analysis The study was laid out in a completely randomized design (CRD) following single factor ANOVA. The data were analyzed statistically after appropriate transformation using MSTAT computer software. Mean values were separated by using DMRT.

Source of Information: Bangladesh j. entomol. 2015, 25(2): 89-97.

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the results of the present study it may be concluded that among tested insecticides with various doses, Superior 505 EC @ 1.00 ml/l of water was found very effective for 100% reduction of different stages of guava whitefly under laboratory condition. The lowest percent reduction of adult and nymphal population of whitefly was obtained by the treatment with Chita 48 EC sprayed @ 0.50 ml/l of water at 24, 48 and 72 HAT. However, the level of effectiveness of the tested insecticides in descending order was: superior>fighter>chita

Knowledge Management: Journal