Article Figures & Data
Figures
- Figure 1.
Percentage of preferred tree species in each land-use category in each of the three regions: Chicago, Cook County except the city of Chicago, and DuPage County. The land-use categories are apartments (Apt); vacant land; parks, preserves and golf courses (Inst-Veg); residential (Resid); commercial (Comm); institutional lands dominated by buildings (IB); and transportation areas and corridors (Trans)
- Figure 2a–c.
The percentages of intermediate and preferred hosts predicted to be defoliated by a gypsy moth outbreak in the city of Chicago (a), suburban Cook County (b), and DuPage County (c). The land-use categories are apartments (Apt); vacant land; parks, preserves and golf courses (Inst-Veg); residential (Resid); commercial (Comm); institutional lands dominated by buildings (IB); and transportation areas and corridors (Trans). No trees are found in the IB and Trans categories for Cook County. No preferred host trees are found in the Trans category for Chicago and the Comm category for DuPage County
Tables
Land Use %Areaa No. of trees %Popb %Leaf biomassc %Leaf biomass Trees per hectare Inst-Vegd 13.3 24,990 49.2 120,270 36.8 563 Residential 43.9 13,080 25.7 170,000 52.0 89 Vacant 6.6 10,800 21.2 28,770 8.8 488 Othere 36.2 1,960 3.9 8,050 2.4 16 Entire area 100.0 50,830 100.0 327,090 100.0 152 ↵a Percent of study area occupied by land use
↵b Percent of total tree population
↵c Metric tons of leaf biomass.
↵d Institutional lands dominated by vegetation (e.g., parks, cemeteries, golf courses).
↵e Other land uses (i.e., agriculture, commercial, industrial, transportation, institutional lands dominated by buildings (e.g., schools)).
- Table 2.
Dry-weight leaf biomass (metric tons) and number of trees by feeding preference class (L, I, and M are least, intermediately, and most preferred hosts), percentage of most preferred hosts, and percentage of canopy defoliated in July by land use in the Chicago area
Area Leal biomass in tons Number of trees × 1.000 PREFa Defol L I M L I M Chicago Vacant 200 1,130 2,750 130 160 200 41% 32% Inst-Vegb 1,620 4,120 4,730 260 850 730 40% 26% Resid 7,440 5,770 7,750 610 490 360 25% 6% Otherc 2,180 270 230 270 40 30 8% 2% Entire area 11,440 11,290 15,460 1,270 1,540 1,320 32% 14% Cook Co.d Vacant 550 1,650 7,600 1,070 1,120 1,680 43% 36% Inst-Vegb 10,020 37,770 40,960 2,430 10,540 7,010 35% 23% Resid 18,730 51,870 24,890 1,820 3,420 1,700 24% 3% Otherc 1,300 130 150 630 170 220 21% 1% Entire area 30,600 91,420 73,600 5,950 15,250 10,610 33% 14% DuPage Co. Vacant 2,010 4,860 8,020 880 1,860 3,710 58% 40% Inst-Vegb 2,090 6,560 12,400 270 1,490 1,400 44% 32% Resid 6,880 23,850 22,820 790 2,450 1,440 31% 20% Otherc 330 1,240 2,220 140 390 80 13% 31% Entire area 11,310 36,510 45,460 2,080 6,190 6,630 45% 26% ↵a Percent of trees that are most preferred by gypsy moth.
↵b Institutional lands dominated by vegetation (e.g., parks, cemeteries, golf courses).
↵c Other land uses (i.e., agriculture, commercial, industrial, transportation, institutional lands dominated by buildings (e.g., schools)).
↵d Suburban Cook County (i.e., Cook county exclusive of the City of Chicago)
- Table 3.
Percent canopy defoliated in August (after adjusting for refoliation) in intermediately preferred feeding class (I), most preferred feeding class (M), and all feeding classes (Total) for each version of the model
Area Main Second Third I M Total I M Total I M Total Chicago 11.4 25.9 13.8 16.1 30.6 17.1 12.7 29.2 15.5 Cook Co. 10.3 25.9 14.2 16.6 30.6 18.9 13.1 29.0 16.7 DuPage Co. 20.3 37.2 25.8 20.4 37.2 25.8 16.1 35.7 23.5 Total area 12.9 29.1 17.2 17.6 32.5 20.5 13.9 30.9 18.4
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