Inheritance of resistance in cowpea (Vigna unguiculata) to the pod-sucking bug Clavigralla tomentosicollis (Hemiptera: Coreidae)

摘要

Inheritance of resistance in cowpea to Clavigralla tomentosicollis StcEl was studied on F, F and F generations produced from crosses made between Ife Brown, a susceptible cultivar (PS), and TVu 3354, a resistant variety (PR), on the pods of which freshly emerged nymphs of C. tomentosicollis were caged. Nymphal weight gain was significantly higher (p < 0.05) on PS. There were no significant differences between the weight gains of nymphs that fed on F, F and F pods. Insect mortality was significantly higher on PR (86.7%) and the F (70.0%) generation. Total nymphal development period was significantly longer on PR (15.0 days) while that on F and F generations was significantly longer than on the F generation. Nymphal survival and adult emergence were observed on eight plants out of 60 and 19 plants out of 80 from the F and F generations, respectively. Broad-sense heritability estimates were 90.3% and 94.3% for the F and F generations, respectively. The results clearly indicated that TVu 3354 has highly heritable resistance to C. tomentosicollis. Copyright pb 2008 John Wiley & Sons, Ltd