Article Figures & Data
Figures
- Figure 1.
Modified funnel on extension pole used to sample insects in honeylocust trees.
- Figure 2.
Illustration of a honeylocust tree surrounded by a high (98%) level of hardscape at a 10-m radius.
- Figure 3.
Illustration of a honeylocust tree surrounded by a low (3%) level of hardscape at a 10-m radius.
Tables
- Table 1.
Average number of insects collected per tree in funnel trap samples taken at 2-week intervals from honeylocust trees.
Sampling date Plant bugs Spider mites Other insects May 11 19.81 a* 1.62 a 3.61 a May 25 12.64 a 0.57 a 2.75 a Jun 8 0.54 b 1.01 a 4.66 ab Jun 22 0.04 b 4.78 b 3.22 a Jul 6 0.0 b 5.99 bc 2.34 a Jul 20 0.0 b 2.19 a 2.30 a Aug 3 0.0 b 1.26 a 3.16 a Aug 17 0.0b 13.90 c 6.65 b Aug 31 0.0 b 12.81 c 5.10 b Sep 14 0.0 b 10.41 bc 3.55 ab ↵* Values in columns followed by the same lower case letter are not significantly different at P = 0.05.
- Table 2.
Average honeylocust density, percentage of hardscape, and species diversity index at a range of radius lengths surrounding honeylocust trees sampled on the Purdue University campus.
Radius length (m) Honeylocust density, mean (trees/ac) Percentage of hardscape, mean Species diversity index, mean 5 103.10 27.2 10 25.78 38.3 0.39 15 17.18 44.1 20 12.89 45.8 0.56 25 10.31 46.3 30 8.59 46.0 1.45 35 7.36 45.9 40 6.44 46.4 1.78 45 5.73 47.1 50 5.67 47.5 2.02 55 5.11 47.8 60 4.65 48.0 2.20 65 4.58 48.4 70 4.21 48.8 2.33 75 3.90 49.2 80 3.83 49.6 2.43 90 2.53 100 3.22 50.2 2.60 150 2.35 50.2 2.65 - Table 3.
Results of forward stepwise multiple regression of honeylocust plant bug (HLPB), mimosa webworm (MWW), and honeylocust spider mite (HLSM) abundance with honeylocust density (DEN), percentage of hardscape (HARD), and species diversity index (DIV) at 10-, 20-, and 100-m radius lengths surrounding the trees.
Dependent variable Radius length Significant variables Unstandardized coefficients Standardized coefficients Model R2 HLPB 10 m NONE — — — 20 m DIV −0.143 −0.412 0.17 100 m DEN −0.0617 −0.571 DIV −33.346 −0.049 0.46 MW 10 m HARD 34.956 0.363 DEN −0.0038 −0.253 0.23 20 m HARD 24.374 0.222 0.05 100 m HARD −40.476 −0.241 DEN 0.0412 0.479 DIV 14.919 0.287 0.28 HLSM 10 m HARD 132.435 0.299 0.09 20 m NONE — — — 100 m DEN 0.1832 0.469 0.22 - Table 4.
Effect of an increase in landscape variables (percentage of hardscape—HARD, honeylocust density—DEN, and tree species diversity index—DIV) on the abundance of honeylocust plant bug (HLPB), mimosa webworm (MWW), or honeylocust spider mite (HLSM) at 10-, 20-, and 100-m radius lengths surrounding honeylocust trees.
Insect abundance Radius length Landscape variable Plant bug (HLBP) Webworm (WWM) Spider mite (HLSM) 10 m HARD No effect Increase Increase DEN No effect Decrease No effect DIV No effect No effect No effect 20 m HARD No effect Increase No effect DEN No effect No effect No effect DIV Decrease No effect No effect 100 m HARD No effect Decrease No effect DEN Decrease Increase Increase DIV Decrease Increase No effect
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