ISHS Acta Horticulturae 510: VII Eucarpia Meeting on Cucurbit Genetics and Breeding
INSECT RESISTANCE IN CUCUMIS MELO ACCESSION 90625 |
| Authors: | N. Boissot, C. Pavis, R. Guillaume, D. Lafortune, N. Sauvion |
| Keywords: | antibiosis, antixenosis, EPG, melon aphid, melonworm, silverleaf whitefly |
| Abstract:
Insects are the main limitations to the growing of melons in the French West Indies. As we observed that biological control is insufficient in reducing pest populations, we have looked for genetic sources of resistance. ‘Védrantais’ and the inbred 90625 were compared for their behavior towards Bemisia tabaci, Diaphania hyalinata, and Aphis gossypii. Field trials were conducted in Guadeloupe (French West Indies) with natural infestations. Laboratory tests were also conducted in order to assess the duration and mortality of immatures of B. tabaci and D. hyalinata. The electropenetrography technique was used to compare feeding behavior of A. gossypii on the two melon accessions. Accession 90625 appeared partially resistant to B. tabaci and to D. hyalinata. Against B. tabaci, its resistance was mainly antibiosis (33% mortality on ‘Védrantais’ leaves and 75% on 90625 leaves), in contrast to antixenosis against D. hyalinata. On 90625, A. gossypii almost did not reach the phloem, suggesting a resistance due to pre-phloem factors. Inbred 90625 is valuable germplasm for breeding and appears to be interesting for genetic studies of insect resistance in Cucumis melo. | |
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