HPSI of date palm (Phoenix dactylifera L.) varieties/ genotypes against fruit borers, Batrachedra amydraula and Arenipses sabella in hot arid region
Keywords:HPSI, differential susceptibility, date palm, Batrachedra amydraula, Arenipses sabella
Host plant resistance is an important component for management of the fruit borers, Batrachedra amydraula and Arenipses sabella owing to difficulties associated with its chemical and biological control. A total of 32 date palm varieties/ genotypes were evaluated for screening against the fruit borers in hot arid region. The results showed that the percentage of fruit infestation of fruit borers, B. amydraula and A. sabella on tested varieties/ genotypes of datepalm varied significantly. Pooled data showed that the Migra, Tayer, Javantri and Medjool were found highly tolerant varieties/ genotypes with fruit infestation (5.32%, 8.40%, 8.40%, 8.78% of B. amydraula and 4.33%, 5.27%, 5.62%, 5.52% of A. sabella, respectively). Whereas, the varieties/ genotypes Zahidi, Suriya, Khasab and Khuneizi had fruit infestation (29.88%, 28.33%, 28.27%, 27.05% of B. amydraula and 20.67%, 19.83%, 17.40%, 19.95% of A. sabella, respectively) and declared as highly infestation varieties/ genotypes to the fruit borers. Lower values of host plant susceptibility indices based on fruit infestation (HPSI) were recorded on resistance varieties/ genotypes, Migra, Tayer, Javantri and Medjool (31.63%, 49.97%, 49.97%, 52.25% of B. amydraula and 40.16%, 48.81%, 52.05%, 51.13% of A. sabella, respectively) which could be used as a source of resistance for developing date palm varieties/ genotypes resistant to fruit borers.
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