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Tables
- Table 1.
Elm leaf beetle defoliation ratings for trees treated in May with trunk-injected abamectin and for untreated controls.
Defoliation rating June August Treatment Median Range Median Range Abamectin 0 a 0 - 1 0 a 0 - 1 Control 2 b 1 - 4 2 b 1 - 4 Defoliation rating scale: 0 (no detectable defoliation) to 9 (defoliation near 100%). Medians in the same column followed by different letters are significantly different (p < 0.01, determined nonparametrically using the Wilcoxon rank-sum test).
- Table 2.
Number of elm leaf beetle larvae surviving six days after feeding on leaves from abamectin-injected and untreated trees collected 83 days after treatment.
Number of larvae surviving (mean ± SE) Treatment Old foliage (5 larvae) New foliage (3 larvae) Abamectin 2.0 + 0.6 a 1.4 + 0.3 a Control 4.8 ± 0.1 b 2.8 ± 0.1 b New foliage: leaves that were not present at the time of treatment (except within buds). Old foliage: leaves that were expanded at the time of treatment. Means in the same column followed by different letters are significantly different (p < 0.001, t-test for means with unequal variances).
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