NEMATODE SUSCEPTIBILITY AND SENSITIVITY OF IN VITRO PROPAGATED ‘VALERY’ BANANAS UNDER FIELD CONDITIONS IN COSTA RICA

D. Waele, Rony L. Swennen, E. Boonen
In a banana plantation in Río Frío, Costa Rica, predominantly infested with Radopholus similis and Helicotylenchus multicinctus, in vitro propagated (IVP) 40 to 45 cm high, 5-leave-stage plantlets of banana cv. Valery (Musa AAA, Cavendish subgroup, Robusta type) were planted adjacent (10–15 cm) to existing flowering mother plants and their susceptibility and sensitivity for nematodes monitored during 12 weeks. Four weeks after planting, nematode densities per root unit in the roots of the IVP plants were already higher than in the mother plants while at 8 weeks after planting they were 3 to 6 times higher than in the mother plants reaching on average 3,860 and 21,280 nematodes per 10 g fresh root weight in a lightly and heavily infested plot, respectively. Between planting and 12 weeks after planting, the average percentage of functional primary roots in the IVP plants decreased from 96.8 to 63.7 % in the lightly infested plot and from 96.8 to 33.1 % in the heavily infested plot. At 12 weeks after planting, the average percentage root necrosis of the remaining functional primary roots was 8 and 24 % in the lightly and heavily infested plot, respectively. These data indicate that during the first 12 weeks in the field the IVP plants were highly susceptible and sensitive for nematodes.
Waele, D., Swennen, Rony L. and Boonen, E. (1998). NEMATODE SUSCEPTIBILITY AND SENSITIVITY OF IN VITRO PROPAGATED ‘VALERY’ BANANAS UNDER FIELD CONDITIONS IN COSTA RICA. Acta Hortic. 490, 361-368
DOI: 10.17660/ActaHortic.1998.490.36
https://doi.org/10.17660/ActaHortic.1998.490.36
Musa, Cavendish, Radopholus similis, Helicotylenchus multicinctus, reproduction, root damage

Acta Horticulturae