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Biorational Management of Mango Hopper Idioscopus Clypealis (leth.) Using a Microbial Pesticide (beauveria Bassiana) and Some Botanicals

M. S. RAHMAN*
Scientific Officer, Pest Management Division, Bangladesh Jute Research Institute, ManikMia Avenue, Dhaka-1207

M. M. JAHAN
Professor, Department of Entomology, Bangladesh Agricuural University, Mymensingh

K. S. ISLAM
Professor, Department of Entomology, Bangladesh Agricuural University, Mymensingh

S. AHMMED
Scientific Officer, Pest Management Division, Bangladesh Jute Research Institute, ManikMia Avenue, Dhaka-1207, Bangladesh

Abstract/ Executive Summary:

The study was conducted at the Entomology IPM Laboratory, Department of Enotmology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh, Bangladesh during February 2014 to March 2015 to generate necessary information for the management of mango hopper. Four insecticides (one microbial and three botanicals) namely Beauveria bassiana, neem oil, mahogany oil and karanja oil were tested against the mango hopper (Idioscopus clypealis (leth). Comparative efficacy of insecticide in the laboratory showed that all the three doses of Beauveria bassiana (1%, 2% and 3%) effectively controlled mango hopper. Among the botanicals 3% neem oil was the most effective best but relatively lower performance was observed in case of 1% mahogany oil. Observation on the effect of a microbial pesticide (Beauveria bassiana) and some botanicals on the infestation of mango hopper at different stages showed that hopper population at pea shaped after prior to second spray was maximum in 1% mahogany oil (13.87) and minimum no. of hopper was found in 3% Beauveria bassiana (7.33).

Keywords: Microbial, Mango hopper, Botanicals, Management.

Location: Entomology IPM Laboratory, Department of Enotmology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh, Bangladesh

Start Date: 00-02-2014

End Date: 00-03-2015

Program Area: Pest Management

Commodity: Mango

Objectives:

The objective of the study was to investigate the efficacy of a microbial pesticide (Beauveria bassiana) and some botanicals against mango hopper in the laboratory.

Methodology:

The study was conducted at the Entomology IPM Laboratory, Department of Enotmology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh, Bangladesh during February 2014 to March 2015. The experimental area was characterized by moderately low temperature, low humidity and scanty rainfall during the February 2014 to April 2015. Botanical insecticides were collected from IPM Laboratory of Entomology Department, Bangladesh Agricultural University (BAU), Mymensingh. A microbial pesticide (Beauveria bassiana) was collected from Ispahani Biotech Company in Bolaspur, Mymensingh. Commercial formulation of Beauveria bassiana was used to conduct the experiment. To conduct experiments six mango trees of Ammapali variety viz. R1, R2, R3, R4, R5, R6 were selected in Aqua, Mymensingh and trial was conducted in Entomology Field Laboratory, BAU, Mymensingh. Completely Randomized Block Design (CRD) was used in this study. Four insecticides each with 3 different doses were evaluated for their effect. The used botanical insecticides were neem oil, karanja oil and mahogoni oil with the dose of 1%, 2% and 3% for each insecticide. The used Beauveria bassiana which dose was 1%, 2% and 3%. For all insecticides, at first 39 petridishes (12 cm diameter) were taken. Fresh, disease free and well developed inflorescences, (approximately 10 cm in length) were collected. One inflorescence was placed in each petridish. Insecticide was sprayed on each inflorescence placed in petridishes and left for air dry before offering insect. Among the 39 petridishes, (3x3x3) = 27 petridishes were used for treatment. Then 10 hoppers (7 adult + 3 nymphs) were released at each petridish and kept for 7 days. Similarly, In case of Beauveria bassiana, 9 petridishes (12 cm diameter) were taken. Fresh, disease free and well developed inflorescences, (approximately 10 cm in length) were collected. One inflorescence was placed in each petridish. Insecticide was sprayed on each inflorescence placed in petridishes and left for air dry before offering insect. (3x3)= 9 petridishes were used for treatment and 3 petridishes were used for control for all insecticides. Small pieces of cotton with soaked fertilized water were placed at the base of the inflorescence to keep the inflorescence fresh. Cotton pieces were changed regularly to avoid the probability of development of fungus and some fertilized water was added to the cotton pieces regularly. In the laboratory daily temperature and humidity were recorded. The data on the number of hopper killed were collected at 1 DAT, 2 DAT, 3 DAT, 4 DAT, 5 DAT, 6 DAT and 7 DAT. Obtained data were analyzed statistically after appropriate transformation using analytical computer software MSTAT and mean values were separated using DMRT.

Source of Information: Int. J. Sustain. Agril. Tech. 14(7): 01-06, July 2018

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results showed that 1% Beauveria bassiana was highly toxic to mango hopper. Among the botanicals neem oil was the highly toxic but mahogany oil was less toxic. The highest number of hopper was killed by 3% neem oil and the lowest by 1% mahogany oil. This experiment revealed that after one month of first spray, the number of hopper at flowering stage was the maximum in 3% mahogany oil (15.17) and lowest hopper was found in 2% karanja oil.But hopper population at pea shaped after prior to second spray was maximum in 1% mahogany oil (13.87) and minimum no. of hopper was found in 3% Beauveria bassiana (7.33). On the basis of hopper infestation after insecticidal treatment it was noted that Beauveria bassiana had the better effect in controlling mango hopper than any other insecticide. Among the botanicals the minimum numbers of hopper were found in 2%, 3% neem oil and 3% karanja oil. To tell in a nut cover, microbial pesticide (Beauveria bassiana) had better performance in controlling mango hopper and ultimately resulting higher yield than botanicals.

Knowledge Management: Journal