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Effect of Organic Fertilizers on Major Insect Infestation in Two Cabbage Cultivars

Md.Jamal Hossain
Researcher, International Rice Research Institute (IRRI), Bangladesh

Golam Mostofa Khan
Crop Protection Specialist, Department of Agricultural Extension, Khamarbari, Dhaka, Bangladesh

Md. Giash Uddin
Dept. of Horticulture, Bangladesh Agricultural University (BAU), Mymensingh, Bangladesh

Md. Tanzilur Rahman
Dept. of Agronomy, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

K. M. Mehadi Hassan
Dept. of Agronomy, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh

Abstract/ Executive Summary:

Organic fertilizers are alterations aiming to improve soil fertility have been found to increase pest populations on cabbage plants. This study was conducted to evaluate the effects of organic fertilizers and weather factors on insect infestation with cabbage cultivars during rabi season of 2007-2008. Two cabbage varieties viz., Atlas 70 and Super tropic and organic fertilizers like control, cowdung, mustard oilcake, Vermicompost and Trichoderma were included in this study. Results revealed that the minimum no. of infested plants plot^-1, infested leaves plant^-1and percent infested leaves plant^-1 were found in variety super tropic with Trichoderma applied plots on different dates of observation while the maximum no. of infested plants plot^-1, infested leaves plant^-1 and percent infested leaves plant^-¹ were in variety super tropic and mustard oil cake applied plots. The highest number and percent (4.00 plot^-1) and (20.00% plot^-1) of infested heads were found in variety Super tropic and mustard oil cake applied plots. Highest number of healthy heads plot^-¹ (19.67), healthy head yield (71.47 ton/ha) and total head yield (72.14 ton/ha) were recorded in variety Super tropic and Trichoderma applied plots while the lowest number of healthy heads plot^-1, healthy head yield and total head yield were recorded in in variety Super tropic and mustard oil cake applied plots. So application of Trichoderma with Super tropic cultivar ensures low insect infestation and better head yield.

Keywords: Cabbage, Varieties, Infestation, Trichoderma, Vermicompost

Location: At agricultural farm of Agricultural Research Station (ARS), Bangladesh Agricultural Research Institute (BARI), Pahartali, Chittagong, Bangladesh

Start Date: 00-11-2007

End Date: 00-04-2008

Program Area: Crop-Soil-Water Management

Commodity: Organic fertilizer, Insects

Objectives:

This study was undertaken to the combine effect of organic fertilizers and varieties of cabbage on the abundance and population dynamics of major insect pests infesting cabbage under field condition.

Methodology:

The field experiment was conducted at agricultural farm of Agricultural Research Station (ARS), Bangladesh Agricultural Research Institute (BARI), Pahartali, Chittagong, Bangladesh to study the influence of variety and organic manures on the profusion and population dynamics of major insect pests on cabbage during rabi season of 2007-2008. Two cabbage varieties viz., Atlas 70 and Super tropic were included in this study. Organic manures were used as treatments like control, cowdung @ 6 kg plot^-1, mustard oil cake @ 750g plot^-1, Vermicompost @ 3 kg plot^-1 and Trichoderma @ 3 kg plot^-1. Experiment was laid out in randomized block design (RBD) with three replications. The entire field was divided into three blocks and each block was again divided into ten plots. The distance between both blocks and plots was 1.0 m. The area of each experimental plot was 9 m². Seeds of the selected cultivars were sown in the month of November and were transplanted in December. Thirty day-old cabbage seedlings were transplanted in the plot of 9 m² area with 45 cm x 45 cm spacing on 30 December, 2007. The chemical fertilizers viz., urea, TSP and MP were applied at the rate of 280, 140 and 210 kg/ha. Fertilizer, irrigation and all other agronomic practices were carried out in the experimental field as and when needed. All inputs for example fertilizer application, irrigation, hoeing and other agronomic practices remained same for all cultivars. Recommended management practices except plant protection measures were followed for raising the crop. Harvesting of transplanted cabbage heads were continued till February 2008. Weekly observations were taken (No. of infested plants plot^-1, No. of infested leaves plant^-1, % of infested leaves plant-1, insect population count plant^-1, % RH and temperature) since one week of transplanting till maturity of the crop. The data obtained were analyzed by analysis of variance. The comparison of means were done using Duncan multiple random test at 0.05 level (Steel and Torrie, 1980).

Source of Information: J. Biosci. Agric. Res. 14(01): 1183-1189

Article Link (Online Journal): https://doi.org/10.18801/jbar.140117.145

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Cultivars of cabbage grown in trichoderma and vermicompost applied plots were found to be less infested by Spodoptera lituraand Pieris brassicae regarding no. of infested plants plot^-1, number and percent of infested leaves plant^-1on different dates of observation. Highest healthy heads (by number), healthy head yield (by weight) and total head yield were obtained from combine effect of variety Super tropic and Tricoderma as well as variety Atlas-70 and vermicompost applied. Finally it may be suggested that soil fertility management by using trichoderma and vermicompost can have several effects on plant quality, which in turn, can affect insect abundance and subsequent levels of herbivore damage.

Knowledge Management: Journal