Abstract
The mean number of frit fly, Oscinella frit (L.), infested stems in field plantings of reed canarygrass, Phalaris arundinacea L., ranged from 11.1 to 39.9% for 16 clones at one site and from 9.7 to 31.2% for 25 clones at another site. The mean number of stems/9.3 dm2 ranged from 31.0 to 101.1 at site 1 and from 56.7 to 148.2 at site 2. Alkaloid contents ranged from 0.075 to 0.617% (d.w.) at site 1 and 0.072 to 0.532% at site 2. Mean percentages of infested stems were negatively correlated with both mean number of stems/9.3 dm2 (r = −0.865) and with total basic alkaloid concentration (r = −0.544). Alkaloid content was positively correlated (r = 0.661) with number of stems/clone. There was a weak negative correlation (r = −0.478) between number of immature frit fly (larvae + pupae)/stem and alkaloids. The mechanism of resistance to the frit fly in reed canarygrass could be nonpreference controlled by stem density or antibiosis controlled by toxic alkaloids, or a combination of both factors. The great variability in frit fly infestation among these clones suggests that selection for resistance to frit fly should be productive.
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