| Popis: |
Sugarcane cultivar resistance to Eldana saccharina is the best strategy to control the stalk borer. The present study aimed to establish the influence of stalk rind hardness, fibre and nitrogen content, and the effect Fusarium species associated with E. saccharina infestation, on borer damage and performance in different sugarcane cultivars. In two glasshouse trials, larvae were inoculated into 7-month-old stalks of seven cultivars with different E. saccharina resistance ratings via wounds created in the rind. In one of the trials, E. saccharina-beneficial fungal strain Fusarium pseudonygamai SC17 and E. saccharina antagonistic F. sacchari PNG40 were inoculated into the stalk of N41 and NCo376 three weeks before larval inoculation. Rind hardness and fibre content were higher in resistant cultivars and mature stalk parts, whilst nitrogen content was lower in these genotypes and in older tissues. However, E. saccharina survival, damage and growth indicators were not entirely consistent with known resistance... |
