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Seasonal Incidence and Effect of Abiotic Factors on Population Dynamics of Major Insect Pests on Some Selected Vegetables and Fruits

K.Begum
Entomology Division, BARI, Gazipur

M. Mahmudunnabi
Entomology Division, BARI, Gazipur

A.K.M.R.H. Ferdous
Entomology Division, BARI, Gazipur

N.K. Dutta
Entomology Division, BARI, Gazipur

A.K.M. Ziaur Rahman
Entomology Division, BARI, Gazipur

D. Sarker
Entomology Division, BARI, Gazipur

M. A. Sarkar
Entomology Division, BARI, Gazipur

S.N.Alam
Entomology Division, BARI, Gazipur

Abstract/ Executive Summary:

Studies were carried out at Entomology Division. BARl. Gazipur, during January. 2014 to May. . 2014 under natural field condition in order to understand the seasonal occurrence and activity of insect pest on some selected vegetables and fruits. Monitoring was done by using sex pheromone traps of eight important pests, viz. Common cutworm (Spodoptera litura), Helicoverpa armigera, DBM (Plutella xylostella), Sweet potato weevil (Cylas formicarius), Mango fruit fly (Bactrocera dorsalis), BSFB (Leucinodes orbonalis), Cutworm (Agrotis ipsilon) and Cucurbit fruit fly (Bactrocera cucurbitae). Temperature, humidity & rainfall data was recorded during the experimental period. There was a profound effect of environment (temperature, humidity & rainfall) on population fluctuation of the specific insect pests and that was positively correlated. Less trapping of common cutworm, (Spodoptera litura) and Helicoverpa armigera were observed in the crop-zone during the experimentation period but surprisingly both pests population gradually increased in non-crop zone, which indicated that those pests have wide host range.

Keywords: Effect , Abiotic, Major insects pests, Vegetables and fruits

Location: Entomology Division. BARl. Gazipur

Start Date: 00-01-2014

End Date: 00-05-2014

Program Area: Pest Management

Commodity: Insects

Objectives:

To study the impact of abiotic factors on the population and seasonal abundance of devastating pests.

Methodology:

The experiment was conducted at Entomology Division, BARI, Gazipur, during January, 2014 to May, 2014 under natural field condition. Sex pheromone traps of Brinjal shoot and fruit borer- Leucinodes orbonalis, Diamond back moth-Plutella xylostella, Common cutworm- Spodoptera litura, Pod borer-Helicoverpa armigera, Sweet potato weevil-Cylas formicarius, Cutworm-Agrotis ipsilon, Mango fruit fly-Bactrocera dorsalis and Cucurbit fruit fly-Bactrocera cucurbitae were set in the field. Traps were set in Brinjal, Tomato, Bitter gourd, Cabbage, Cauliflower, Country bean, Chickpea, Potato and Sweet potato field as crop zone and Maize, Sunflower, Mustard, Lentil and Road side for non crop zone. Sucking insect pests like aphid, jassid, thrips and white fly, specially designed yellow and white sticky traps were used and for other insect pests sex pheromone traps were used. Trap distance was maintained. For white and yellow sickly trap, 2m x 2m (alternately), sex pheromone, 10m x 10m except Spodoptera (40m x 40m) and fruit fly 12m x 12m were maintained. Five traps of each insect pest were set in crops zone and five traps were set in non-crop zone. After setting the trap, soapy water was poured. Data on trapped insect pests/trap/week was and presented in linear graphs.

Source of Information: Annual Research Report, Entomology Division, BARI, Gazipur,2013-2014

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the above results it may be concluded that environmental factor like temperature, humidity and rainfall played a very important role on population fluctuation of those important pest. During the experimentation period, the mean range of temperature, humidity and rainfall was 16.10-31.5 °C, 46.5%-88.5% and 0-1.8 mm respectively . The weather data revealed that temperature was gradually increased from January to first week of May but higher temperature and humidity was prevailed during the month of March to May, 2014 and no rainfall resulted the higher pest population as well as more no. of insect pests was trapped. Temperature and humidity showed a positively significant influence on the population fluctuation. More over the trapping of Spodoptera and Helicoverpa in the non-crop zone indicated the those pests poses multi host.

Knowledge Management: Report/Proceedings