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Abundance and Diversity of Rice Arthropod Populations as Influenced by Neighbouring Crops and Different Rice Growth Stages

Partha Mukherjee
MS student
Department of Entomology, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

Dr. Md. Mohasin Hussain Khan
Professor & Research Supervisor
Department of Entomology, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

Abstract/ Executive Summary:

Seven different insect pests and seven different natural enemies were recorded from the rice habitats. Among the different habitats total number of insect pests was highest in rice-rice habitat (1045 insect pests/160 sweeps and was lowest in rice-sesame(Til) habitat (762 insect pests/160 sweeps). Total number of natural enemies was found highest in rice-tree habitat (636 natural enemies/160 sweeps) and lowest in rice-maize habitat (553 natural enemies/160 sweeps). In case of different rice growth stages, highest number of insect pests was found in panicle initiation stage (1808 insect pests/160 sweeps) and lowest number was found in early tillering stage (131 insect pests/160 sweeps). Highest number of natural enemies was found in seedling stage (1026 natural enemies/160 sweeps) and lowest number was early tillering stage (386 natural enemies/160 sweeps).Diversity index (H) and richness (M.I.) were found highest in rice-rice habitat (1.39 and 20.33, respectively) while evenness (J') and D were found highest in rice-tree habitat (0.74 and 2.46, respectively). In case of natural enemies, diversity index (H), Evenness (J?) and D were found highest in rice-tree habitat (1.60, 0.88 and 2.98 respectively) Out of 4 growth stages, diversity index (H) and richness (M.I.) were found highest in early tillering stage (1.34 and 14.27, respectively) while evenness (J') and D were found highest in seedling stage (0.79 and 1.98, respectively).

Keywords: Growth stage, Habitat, Insect pest, Natural enemies

Location: PSTU campus

Start Date: 01-01-2012

End Date: 30-06-2012

Program Area: Pest Management

Commodity: Rice

Objectives:

1.To assess the abundance and diversity of insect pests and natural enemies in rice fields as influenced by rice and non-rice habitats,

2.To assess the abundance and diversity of insect pests and natural enemies in rice fields as influenced by different growth stages of rice

3.To know the influence of climatic factors on the insect pests and natural enemies.

Methodology:

Experiments were conducted to determine the abundance and diversity of rice arthropod population in rice fields as influenced by neighboring crops and different rice growth stages at the experimental farm of Patuakhali Science and Technology University, Dumki under Patuakhali district during the period from January to June 2012 in Boro rice. Experiments were conducted at the experimental farm of Patuakhali Science and Technology University, Dumki under Patuakhali district. The layout of the experiments was Randomized Complete Block Design (RCBD) with four replications.A variety of non-rice crops viz. Sesame (Til), Maize etc. were grown widely along with rice. To study the effect of different adjacent crop habitats on the abundance and diversity of rice arthropod population in rice fields, 4 types of rice fields were selected. These were:(a) Rice field adjacent to Sesame (Til) field designated as rice-sesame habitat(b) Rice field adjacent to Maize field designated as rice-maize habitat(c) Rice field adjacent to trees designated as rice-tree habitat(d) Rice field adjacent to rice field designated as rice-rice habitat.The rice variety BRRIdhan 29 was grown in all the experimental fields in boro season.The insect pests of rice and their natural enemies were collected by a sweep net. Sweeping was done from the plant canopy level including the interspaces between plants as well as close to basal region of the plants as far as possible. In each field, l0 complete sweeps were made to collect the insect pests and their natural enemies. Sampling was done at four stages of rice viz. seedling, early tillering, maximum tillering and panicle initiation stage. Sampling was done during morning hours at all study fields on all sampling dates.The insect pests and nafural enemies were collected and kept separately in labeled container. The collected samples were properly preserved, identified, sorted and counted in the laboratory of Entomology.

Source of Information: MS Thesis

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results showed that abundance of most insect pests was greater in rice-rice monocropping compared to polyculture habitats while in most cases abundance of natural enemies was greater in polycultures (rice-tree) compared to monoculture (rice-rice) habitat. Thus, greater number of arthropod natural enemies can suppress pest populations in diverse habitats which can bring benefits to farmers. On the other hand, as the diversity of insect pests is same in both monoculture and polyculture, so no variation was observed on the diversity of insect pests in monoculture and polyculture habitats while natural enemies was found higher in rice-tree polyculture. In case of different rice growth stages, insect pests are more abundant at panicle initiation stage while natural enemies are more abundant at seedling stage.Therefore the study revealed that diverse habitat suppressed insect pest populations and enhanced arthropod natural enemy populations and also found to conserve more faunal diversity than rice- rice monoculture. Therefore, the findings of the study may helpful in developing elements of Integrated Pest Management (IPM) program through ecological pest management designed for rice based cropping system.

Knowledge Management: Journal, Thesis