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Prevalence of Insects Influenced by Tree Litter and N-fertilizer on Br11

M. J. Uddin
Graduate Student, Department of Agroforestry, Bangladesh Agricultural University, Mymensingh-2202

Masum Ahmad
Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202

M. Asaduzzaman
Patuakhali Science and Technology University, Dumki, Patuakhali

Abstract/ Executive Summary:

A field experiment was conducted at the Agroforestry Farm, Bangladesh Agricultural University, Mymensingh in 2005 to find out the effect of tree litter and N-fertilizer combinations on the prevalence of different insects and their interaction on BR-11 rice. Rice was grown in 4 levels of tree litter (L₀=control, L₁=2 ton ipil-ipil ha^-1, L₂= 4 ton ipil-ipil ha^-1, L₃=6 ton ipil-ipil ha^-1) and 4 levels of N fertilizer (N₀= control, N₁= 86.7 Kg. Nitrogen ha^-1 N₂ =86.7 Kg. Nitrogen ha^-1, N₃=86.7 Kg. Nitrogen ha^-1). The result revealed that the prevalence of insects viz. grasshopper, brown plant hopper, rice bug and rice hispa were significantly affected by the application of tree litter and N-fertilizer. The highest prevalence of insect viz. grasshopper (45.67), brown plant hopper (8.98), rice bug (4.00) and rice hispa (43.32) and % white head (0.08) was found in L₃N₃ treatment combination and lowest prevalence of grasshopper (24.46) brown plant hopper (2.33), rice bug (1.33) and rice hispa (26.67) and white head (0.02) was found in the L₀N₀ combination.

Keywords: Insect prevalence, Tree litter, N-Fertilizer, BR-11.

Location: Agroforestry Farm, Bangladesh Agricultural University, Mymensingh

Start Date: 00-07-2005

End Date: 00-10-2005

Program Area: Pest Management

Commodity: Rice

Objectives:

1. To find out the influence of tree litter and N-fertilizer on the prevalence of insect pests in rice field.

Methodology:

The experiment was conducted in two factor Randomized Complete Block Design (RCBD) with three replications. Tree litter combined with different levels of nitrogenous fertilizer was considered as treatments in the study. The plot size was 4x2.5 m2. The following two factors were used in this experiment: Factor (A): Tree litters i) L₀ (control) ii) L₁ ( 2 ton ipil-ipil ha^-1) iii) L₂ ( 4 ton ipil-ipil ha^-1) iv) L₃ ( 6 ton ipil-ipil ha^-1) Factor (B): Different level of N-fertilizer i) N₀ (Control) ii) N₁ (86.7 kg nitrogen ha^-1) iii) N₂ (130 kg nitrogen ha^-1) iv) N₄ (173.4 kg nitrogen ha^-1) Five major insect species namely, stem borer, brown plant hopper, rice hispa, grass hopper and rice bug were taken into consideration and their prevalence was measured as follows- Sweeping was done from the plant canopy level including inter space between plants as well as close to the basal region of the plants. In each field, 10 sweeps was made in cross-section. The collected sample was stored in a jar and counted in the laboratory. To asses the prevalence of rice bug early morning was chosen because the insects are not active at that time. By selecting 1m² area at 4 different sites in each plot the number of bugs were recorded. The same procedure also followed for rice hispa. The prevalence of stem borer was determined based on the percentage of white head. Twenty hills were recorded. The damage is assessed.The data collected throughout the experiment were computed and analyzed. DMRT were done in order to show the significant differences between the treatment means. The percent data were transformed by Arc Sin or Square- Root transformation depending on range of percent data. The Data ranging from 0-30% and 70-100% were transformed by Square Root transformation and that of 30-70% by Arc Sin.

Source of Information: J. Agrofor. Environ. 1(1): 2007; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest prevalence of insect viz. grasshopper (45.67), brown plant hopper (8.98), rice bug (4.00) and rice hispa (43.32) and % white head (0.08) was found in L₃N₃ treatment combination and lowest prevalence of grasshopper (24.46) brown plant hopper (2.33), rice bug (1.33) and rice hispa (26.67) and white head (0.02) was found in the L₀N₀ combination.

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