Submitted to: African Crop Science Journal
Publication Type: Peer reviewed journal
Publication Acceptance Date: 2/2/1999
Publication Date: N/A
Citation: Minja, E.M., Shanower, T.G., Silim, S.N., Singh, L. 1999. Evaluation of pigeonpea pod borer and pod fly tolerant lines at Kabete and Kiboko in Kenya. African Crop Science Journal. 7(1):71-79. Interpretive Summary: Pigeonpea lines developed at ICRISAT in Patancheru, India were evaluated at two locations, Kabete and Kiboko, in Kenya. These lines had demonstrated tolerance to pod borer and pod fly in India. They were compared to five local lines under sprayed and unsprayed conditions. All lines were damaged by pod borer and pod sucking bugs, though spraying reduced damage substantially. Several lines showed tolerance to pod fly an pod borer damage, but this did not protect them from pod sucking bug damage.
Technical Abstract: Pigeonpea lines which have shown tolerance to pod borer and pod fly damage at ICRISAT, Patancheru, India were tested in the field at Kabete and Kiboko, Kenya, and compared with five local checks. There were sprayed and unsprayed plots for each line. Endosulfan 35EC was applied at 0.07% active ingredient (a.i.) Starting at flower bud expansion stage, at 50% flowering, early podding, and full podding stages. At crop maturity, all pods from three plants plot-1 were sampled and seed damage by different insect pests determined. The results showed that seeds from all lines were damaged by pod borers and pod sucking bugs. Pod fly incidence was greater at Kabete than at Kiboko, and damage was lower in test lines than on checks. Spraying reduced seed damage from 57.6% to 9.3% and from 59.9% to 4.5% on pod borer lines and pod fly lines, respectively, at Kiboko, and from 19.9% to 5.4% on pod fly lines at Kabete. At Kiboko seed damage in unsprayed pod borer (57.6%) and pod fly (59.9%) was similar. Seed damage o pod fly lines at Kiboko (59.9%) was significantly higher than at Kabete (19.9%). Positive significant correlations were observed between seed mass and pod fly damage at Kabete (r=0.31) and Kiboko (r=0.30). The results indicated that although some lines showed tolerance to pod borer and pod fly damage, they were highly susceptible to pod sucking bugs, suggesting that such tolerance does not hold against other insect groups.