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Management of Guava Whitefly, Aleurodicus Dispersus Russell (homoptera: Aleyrodidae)

Dr. Md. Mohasin Hussain Khan
Professor
Department of entomology, Patuakhali Science and Technology University, Dumki, patuakhali-8602, Bangladesh.

Abstract/ Executive Summary:

Results revealed that the efficacy of test insecticides in decreasing order was Ripcord 10EC @ 0.75ml/L of water>Karate 2.5EC @1.00ml/L of water>chita 48EC @0.75ml/L of water>Aktara 25WG @ 5g/L of water were effective in the reduction of 1st and 2nd instar nymphal populations of guava whitefly. In caswe of 3rd and 4th instar nymphs, the efficacy of test insecticides in decreasing order was Aktara 25WG @ 5g/L of water>Karate 2.5EC @1.00ml/L of water>chita 48EC @0.75ml/L of water>Ripcord 10EC @ 1.00ml/L of water for reducing whitefly populations. For the reduction adult whitefly, the efficacy of test insecticides in decreasing order was Chita 48EC @ 1.00ml/L of water>Ripcord 10EC @ 1.00ml/L of water>Aktara 25WG @ 5g/L of water>Karate 2.5EC @ 0.75ml/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. Trix applied @ 7.5g/L of water was the most effective detergent in reducing the populations of different stages of guava whitefly. the efficacy of test detergents in decreasing order was Trix>Jet>wheel powder.

Keywords: Guava, Whitefly, Insecticide, Detergent

Location: PSTU campus and Farmers' orchard

Start Date: 00-01-2013

End Date: 00-10-2013

Program Area: Pest Management

Commodity: Guava

Objectives:

To investigate the bio-efficacy of modern insecticides and detergents for the management of guava whitefly.

Methodology:

The efficacy of four insecticides, each having two doses along with control were determined by testing against guava whitefly attacking guava plants at PSTU campus and in some selected farmers’ orchard during to January to October 2013. Four insecticides viz., Ripcord 10EC (@1.00ml/L of water and 0.75 ml/L of water), Karate 2.5EC (@1.00ml/L of water and 0.75 ml/L of water), Chita 48EC (@1.00ml/L of water and 0.75 ml/L of water) and Aktara 25WG (@ 5g/L of water and 2.5g/L of water)were applied on the plant when the pest population build up was enough to cause damage. Each treatment was replicated four times. The field population of the pest on the leaves was recorded by absolute counts using 10xmagnifying glass. The pretreatment data was taken at one day before application of insecticide.The field efficacy of three detergents (Wheel powder, Jet and Trix) having three doses (2.5g/ L of water, 5.0g/L of water and 7.5g/L of water) of each and water along with a control was evaluated against guava whitefly at PSTU campus, Dumki, Patuakhali and farmer’s orchard during January to October 2013. Each treatment was replicated three times. The treatments were applied to the plant when the pest population was sufficient to cause damage. During application of detergents and water, care was taken to maintain the distance around 25 cm between the nozzle and twig. Spraying was done from the lower surface of the leaf and the plant will be thoroughly covered with the fluid.

Source of Information: Research report

Article Link (Online Journal):

Funding Source:

1.	Budget: 50,000/ (Fifty thousand)

Total Budget (Tk.) : 50,000/ (Fifty thousand)

Achievement/Findings:

Among the test insecticides, Ripcord 10EC @ 0.75ml/L of water was the most effective in reducing 1st and 2nd instar nymphs and Aktara 25WG @ 5g?l of water was effective in reducing 3rd and 4th instar nympms.For the reduction adult whitefly, Chita 48EC @ 1.00ml/L of water was found most effective.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.Trix applied @ 7.5g/L of water was the most effective detergent in reducing the populations of different stages of guava whitefly. the efficacy of test detergents in decreasing order was Trix>Jet>wheel powder.

Knowledge Management: Report/Proceedings