ISHS Acta Horticulturae 529: III International Pineapple Symposium
SUPPRESSION OF RENIFORM NEMATODES WITH TROPICAL COVER CROPS IN HAWAII PINEAPPLE |
| Authors: | K. Wang, B.S. Sipes |
| Keywords: | reniform nematode, cover crop, pineapple |
| Abstract:
Management of reniform nematode, Rotylenchulus reniformis, on pineapple, Ananas comosus, is increasingly difficult because of loss of chemical alternatives. Twelve cover crops were screened for R. reniformis in the greenhouse. Crotalaria juncea, Lolium multiflorum, Triticum aestivum, Paspalum conjugatum, Infigofera spicata, and Glycine javanica reduced soil populations of R. reniformis. Macroptilium atropurpureum, Lycopersicum esculantum, Trifolium repens, Lablab purpureus, Sesbania gandifolia, and Desmonuim trifolium did not reduce populations of R. reniformis. Three other cover crops with allelopathic activities including Sunn hemp (C. juncea), yellow mustard (Sinapis alba) and marigold (Tagetes erecta) were grown as intercycle crops for 3 months. R. reniformis population densities were reduced in all cover crop treatments during the intercycle period with the greatest reduction in S. alba. The R. reniformis suppression lasted until 6 months-after pineapple planting in the C. juncea treated plots with highest pineapple plant height at 12 months after planting. R. reniformis suppressiveness by C. juncea was more effective in soil with lower or less active initial populations than soil with higher or more active nematodes. This effect is in part due to enhancement of nematode-trapping fungal population densities. C. juncea is a promising cover crop for R. reniformis management. | |
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