Abstract
Studies on the resistance to top borer (S. nivella) in sugarcane varieties were made in the plant and ratoon crops. Eight varieties, namely, P. 12235, Co. 1007, Co. 1107, Co. 1148, Co. 1328, G. 12061, CoJ.46 and CoL.9 were grown in 4 replications of 6 rows of 30 meters each. Samples of stalks were taken from 5.0 per cent row length and also four samples of 10 stalks each under the graded incidence of 0, 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100.0 per cent from, 400 stalks, cut at random and pooled, in each variety. It turned out that CoL.9 hitherto considered as a susceptible variety towards the top borer, obtained the overall rated value 1, having the least total loss for the sum of characters (stalk length, number of internodes, girth, weight, sucrose and C.C.S.). It was suggested that in top borer endemic areas CoL.9 and P.12235 may be preferred both as plant and ratoon crops.
Simple and partial correlations worked out between the per cent of incidence and different loss characters showed that there existed a positive and significant relation between them. The regression coefficient showed a linear relationship between them. The regression equations were also worked out. It was found that from the incidence values alone the relative amount of losses caused in different varieties by the top borer could be confidently predicted.
It was concluded that the sugarcane varieties could be screened for resistance to top borer simply by recording the percentage of borer incidence.
Résumé
L’étude de la résistance àS. nivella de variétés de canne à été faite dans des champs de plants et de repousses. Huit variétés ont été cultivées en 4 répétitions de 6 rangs de 30 mètres chacun. Pour chaque variété des échantillons de tiges furent prélevés sur 5% de la longuer du rang ainsi que 4 échantillons de 10 tiges, chacun selon une échelle progressive de 10 en 10% allant de 0 à 100% pour 4000 tiges coupées au hasard et mises ensemble. Il en ressort que la variété Col. 9 considérée jusqu’à présent comme sensible au foreur, a obtenu la valeur maximum de 1 correspondant aux pertes totales les plus faibles pour la somme des caractères: longueur de la tige, nombre d’internœuds, circonférence, poids, teneur en sucrose et en C.C.S. Il est proposé que dans les régions où le foreur est endémique les variétés Col. 9 et P. 12235 soient préférées pour les champs de plants et ceux de repousses.
Les corrélations simples et partielles établies entre le pourcentage d’attaques et les différents critères de pertes montrent qu’il existe entre eux une relation positive et significative, avec un coefficient de régression correspondant à une droite. Il apparaît que d’après les seuls degrés d’attaque il est possible de prévoir avec assurance les taux relatifs des pertes provoquées par le foreur chez les différentes variétés.
On en conclut que les variétés de canne à sucre peuvent être choisies pour leur résistance au foreur simplement par la notation du pourcentage d’attaques.
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Agarwal, R.A., Singh, J.P. & Tiwari, C.B. Technique for screening of sugarcane varieties resistant to top borer,Scirpophaga nivella F.. Entomophaga 16, 209–220 (1971). https://doi.org/10.1007/BF02371171
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DOI: https://doi.org/10.1007/BF02371171