Submitted to: Food Legume Research International Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 9/22/1997
Publication Date: N/A
Interpretive Summary: Not required.
Technical Abstract: Mass screening of pea germplasm in Australia using unreplicated field trials at nine sites and over four years were used to classify Pisum germplasm (P. sativum L. and P. fulvum Sibth. and Sm) as potential sources of resistance to the pea weevil, Bruchus pisorum (L.). The emergence of adult weevils from less than 10 percent of harvested seed was used as the selection criterion to indicate possible resistance. A total of 1,900 Pisum accessions were assessed using the field trials and 1,754 of the P. sativum accessions were eliminated. In the 18 P. fulvum accessions screened, the level of infestation by pea weevil was always below the arbitrary resistance to the pea weevil. Glasshouse trials to quantify pea weevil resistance in wild peas accessions in Australia and the USA using in situ screening techniques demonstrated the presence of a cotyledon based mechanism in all 31 P. fulvum accessions tested. The mechanism inhibited, to varying degrees, the development of pea weevil larvae as compared to control lines (commercial cultivars) in all the P. fulvum accessions. Larval mortality varied from 40-100 percent. The majority of larvae died as first instars before they had visibly damaged the cotyledons Screening trials in Australia and the USA indicated that populations of pea weevil in both countries respond in a similar way to the tested P. fulvum accessions.