Within-Crown Distribution of Cone and Seed Insect Damage to Slash Pine Flowers, Conelets, and Cones
Abstract
From 76 to 87% of the total cone crop was located in the upper half of the tree crowns of slash pines, Pinus elliottii Engelm. var. elliottii, in Baker County, Florida. The east and south quadrants supported significantly larger crops than the north and west quadrants. The numbers of female strobili attacked by the slash pine flower thrips, Gnophothrips fuscus; cone-worms, Dioryctria spp.; or seedworms, Laspeyresia spp., did not differ significantly among the quadrants. Significantly greater numbers and percentages of cones in the upper crown were infested by Dioryctria spp. More cones in the upper crown were infested by Laspeyresia spp., but the percentage of cones infested, as well as the average number of Laspeyresia larvae per cone, did not vary significantly between levels or among quadrants. The proportion of full, empty, and seedbug damaged seed did not differ significantly among quadrants or crown levels.Downloads
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