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Neoplasm formation, a non-meristematic tissue growth on young field pea ( Pisum sativum  L.) pods is triggered in the absence of UV light and/or in response to oviposition by pea weevil ( Bruchus pisorum  L.). This trait is expressed in some genotypes [neoplastic ( Np ) genotypes] of  P .  sativum  and has the capacity to obstruct pea weevil larval entry into developing seeds. In the present study, 26% of the tested accessions depicted the trait when grown under greenhouse conditions. However, UV light inhibits full expression of this trait and subsequently it is inconspicuous at the field level. In order to investigate UV light impact on the expression of neoplasm, particular  Np  genotypes were subjected to UV lamp light exposure in the greenhouse and sunlight at the field level. Under these different growing conditions, the highest mean percentage of  Np  pods was in the control chamber in the greenhouse (36%) whereas in single and double UV lamp chambers, the percentage dropped to 10 and 15%, respectively. Furthermore, when the same  Np  genotypes were grown in the field, the percentage of  Np  pods dropped significantly (7%). In order to enhance  Np  expression at the field level, intercropping of  Np  genotypes with sorghum was investigated. As result, the percentage of  Np  pods was threefold in intercropped  Np  genotypes as compared to those without intercropping. Therefore, intercropping  Np  genotypes with other crops such as sorghum and maize can facilitate neoplasm formation, which in turn can minimize the success rate of pea weevil larvae entry into developing seeds. Greenhouse artificial infestation experiments showed that pea weevil damage in  Np  genotypes is lower in comparison to wild type genotypes. Therefore, promoting  Np  formation under field conditions via intercropping can serve as part of an integrated pea weevil management strategy especially for small scale farming systems.

Enhancing Neoplasm Expression in Field Pea (Pisum sativum) via Intercropping and Its Significance to Pea Weevil (Bruchus pisorum) Management