Renou Alain, Chongrattanameteekul Wiboon.
1997. Morphological factors involved in cotton jassid tolerance.
In : Abstracts. Regional conference and workshop on "cotton research and development in South-East Asia" and the third national cotton conference. Kasetsart University; CIRAD-CA; Ministry of Foreign Affairs
Résumé : Through three years studies, it appeared that injuries caused by cotton jassid, Amrasca biguttula biguttula (Ishida), to cotton plants (Gossypium hirsutum Linneaus and HAR hybrids) mainly depended on infestation level and duration of occurrence for most of the cultivars. However, differences among cultivars in jassid susceptibility were noticed and were associated to differences in jassid infestation level. Lower jassid infestations mainly originated from lower egg deposition. Thus, chemical or morphological factors of cotton plants which could hinder jassid development are probably not the main important factors involved in jassid tolerance or resistance. Morphogenetic characteristics of leaves which interfere with jassid egg deposition were investigated in this study. Despite slight adverse effects (higher whitefly and thrips infestations), hairiness of leaves which provides low Jassid infestations, is important for cotton breeders in Southeast Asian countries. On hairy cultivars, jassid infestations could be lowered up to 50% as compared to those observed on smooth leaf cotton. However, hairiness of leaves is not completely achieved before node 9 and hairy cultivars may also suffer from early and heavy jassid infestations during early growing season. Among other morphogenetic characteristics of leaves, thickness of leaf or cuticule should be taken into account as use of cotton growth regulator, such as mepiquat chlorid, also reduced jassid infestations. On the other hand, reduced area of leaves (okra characteristic) did not influence Jassid susceptibility of cotton cultivars.
Auteurs et affiliations
- Renou Alain, CIRAD-CA-COTON (THA)
- Chongrattanameteekul Wiboon
Source : Cirad - Agritrop (https://agritrop.cirad.fr/392567/)
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