Screening of horsegram accessions towards Pulse beetle, Callosobruchus chinensis (Linnaeus.) under laboratory condition

Screening studies of horsegram accessions towards pulse beetle, Callosobruchus chinensis under laboratory conditions were carried out at Regional Research Station, Paiyur during the year 2016 for a period of nine months. The results showed that the maximum number of eggs were laid in only two accessions viz., Poonamalli 2 (70.0 No.s) and in Hosur 3 (65.5 No. of eggs). The minimum number of eggs was laid in only one accession in case of KPT 20 Kr (10 eggs) which contributed for bruchid resistance. The maximum number of accessions (385 Nos) fall under the category of 10-20 eggs laid followed by 274 accessions with laid eggs of 20-30 Nos and seventy nine accessions with egg laying capability of 30-40 Nos per accession. Out of 760 accessions, fifty per cent of accessions contributed for resistance, 36.05 per cent for moderate resistance and 21.0 per cent towards moderate susceptible to susceptible nature to C. chinensis. The per cent loss studies due to bruchids showed that the per cent loss ranged from 0.0-15.46 and the highest 15.46 was reported in 12 accessions tested. The highest number of eggs laid (35.0 Nos) and 4.5 seed damage was reported in PYR 2 variety. The lowest number of eggs was laid in Paiyur Acc 15 (15.5 Nos) with six per cent of affected seeds. The per cent affected seeds were found to be highest in Paiyur Acc 3 with 20 per cent damage.