Abstract
The motile stages of the grape mealybug ( Pseudococcus maritimus (Ehrhorn)) distribute themselves in a nonrandom pattern on the pear host. The number of mealybugs varies inversely with the distance from the scaffold limbs and with the height from the ground. A curvilinear (logarithmic) regression line appeared to characterize these data. The number of mealybugs per leaf on shoots arising directly from the scaffold limbs increased with an increase in diameter of the scaffolds. There were also indications that the insect prefers the undersides of leaves on upward-growing shoots.
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