Effects of cucumber genotype on the induction of resistance to powdery mildew, Sphaerotheca fuliginea, by 2, 6-dichloroisonicotinic acid |
| |
| Authors: | T HIJWEGEN MA VERHAAR |
| |
| Institution: | Department of Phytopathology, Wageningen Agricultural University, Wageningen, The Netherlands |
| |
| Abstract: | Conspicuous differences in inducibility of resistance to powdery mildew between susceptible and partially resistant cucumber cultivars were found when 2, 6-dichloroisonicotinic acid (INA) was used as a model substance. In the partially resistant cv. Flamingo, EC50 was approximately 0·25 mg/1. In the susceptible cvs Corona and Lange Groene Gigant it was approximately 6mg/1. In greenhouse experiments with cv. Flamingo, powdery mildew could be well controlled with fortnightly applications in doses as low as 0·5 mg/1. The effect was highly cumulative. |
| |
| Keywords: | |
|
|
