Abstract
Fifteen varieties of mungbean were evaluated for resistance against major insect pests i.e., leaf folder (Cnaphalocrocis medinalis), flea beetle (Phyllotreta nigripes), thrips (Megalurothrips distalis), gram pod borer (Helicoverpa armigera) and legume pod borer (Maruca vitrata). Screening was done on the basis of incidence of insect pests from first incidence upto harvest. Statistically significant variation on recorded data was observed at different days after sowing. The lowest leaf folder population was recorded on variety BARI Mung-4 (1.08 larvae per plot) while the highest (2.05) on variety BARI Mung-6. The flea beetle population was the lowest on variety BARI Mung-4 (1.67 flea beetles per plot) while the highest (3.04) was recorded on variety BARI Mung-6. The lowest population of thrips was observed on variety BARI Mung-4 (1.43 thrips per 10 opened flowers) and the highest population (2.67) was observed on variety BINA Moog-7. The lowest gram pod borer population was observed on variety BARI Mung-4 (1.03 caterpillars per plot) while the highest gram pod borer population was observed on variety BARI Mung-6 (2.24). The lowest population of legume pod borer was observed on variety BINA Moog-4 (1.18 larvae per plot) while the highest population (2.75) was recorded on variety BARI Mung-6. Among the tested varieties, BARI Mung-4 was proven comparatively the least pest infested and highest resistant variety. On the contrary, BARI Mung- 6 showed least resistance. Rest of the varieties expressed moderately resistance to major insect pests. The results showed that none of the tested varieties was completely resistant to major insect pests. SAARC J. Agric., 19(2): 207-217 (2021)
Highlights
The agro-ecological conditions of this country suit its cultivation. It is grown in three seasons in a year in Bangladesh and more than 70% mungbean area is concentrated in the three southern districts viz. Patuakhali, Barisal and Noakhali within agroecological zone (AEZ) 13 and 18, and Patuakhali alone occupies about 30% area (Mondol et al, 2013)
Data on the number of leaf folder, flea beetle, thrips, gram pod borer and legume pod borer were recorded at different days after sowing (DAS)
The number of leaf folder per plot was the lowest (1.08) on BARI Mung-4 followed by BINA Moog-4 (1.10) which was statistically identical to that of BINA Moog-5 (1.10) whereas the highest (2.05) was on BARI Mung-6 followed by BINA Moog-7 (1.89), BARI Mung-5 (1.61) and BARI Mung-3 (1.41)
Summary
Mungbean (Vigna radiata) belonged to the family Fabaceae and sub-family Papilionaceae, is an important legume crop grown widely in Bangladesh. The agro-ecological conditions of this country suit its cultivation It is grown in three seasons in a year in Bangladesh and more than 70% mungbean area is concentrated in the three southern districts viz. Patuakhali, Barisal and Noakhali within AEZ 13 and 18, and Patuakhali alone occupies about 30% area (Mondol et al, 2013). Several insect pests have been reported to infest mungbean and damage the seedlings, leaves, stems, flowers, buds, pods causing considerable losses (Sehgal and Ujagir, 1988; Karim and Rahman, 1991). Heavy infestation of flea beetle in mungbean causes leaves to dry up and the plant growth is rendered with few pods It feeds on the cotyledons, making the severe innumerable round holes on leaves of young plants and dried the older damaged leaves. Keeping these factors in views, the present study was conducted with fifteen varieties of mungbean to screen the varieties with resistance against major insect pests
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