Article Figures & Data
Figures
- Figure 1.
Comparative size of 68 commercial firms in Illinois based on number of employees.
- Figure 2.
Comparative gross sales in thousands of dollars of 64 firms in Illinois engaged in commercial arboriculture.
- Figure 3.
Comparative percentage of gross sales derived from pest control services by 63 Illinois commercial arborists.
Tables
- Table 1.
The number of commercial arborists (out of 68 who responded) that reported use of a particular pesticide in 1982.
Fungicide Use frequency Insecticide Use frequency Arbotect 16 Acephate 31 Benomyl 43 BT 26 Bordeaux 13 Carbaryl 53 Captaiol 2 Chlordane 9 Captan 16 Chlorpyrifos 23 Chlorothalonil 7 Diazinon 38 Copper 3 Dicofol 32 Cycloheximide 6 Dimethoate 42 Dinocap 2 Disulfoton 1 Dodine 2 Ethion 1 Ferbam 9 Lindane 9 Folpet 3 Malathion 57 Mancozeb 10 Methoxychlor 18 Maneb 15 Oil (dormant) 46 Streptomycin 9 Oxydemeton methyl 2 Sulfur 2 Trichlorofon 1 Thiram 10 Zineb 24 - Table 2.
The reported frequency of spray use by commercial arborists to trees of a fungicide, insecticide, or a combination of both in 1982.
Host Total No. that sprayed Insecticide Fungicide Combination Arbor-vitae 39 30 0 9 Ash 47 35 1 11 Birch 50 45 1 4 Boxwood 18 15 0 3 Cherry 35 20 1 14 Crabapple 49 8 4 37 Currant, alpine 22 11 4 7 Dogwood 26 21 1 4 Elm 46 29 2 15 Euonymus 45 40 0 5 Fir, spruce, yew 47 36 0 11 Hawthorn 42 4 9 29 Honeylocust 46 41 0 5 Horsechestnut 29 16 3 10 Juniper 48 25 1 22 Maple 49 37 1 11 Mountain ash 34 18 2 14 Oak 45 29 0 16 Pine 47 33 1 13 Rhododendron 24 16 1 7 Sycamore 39 8 10 21 Tulip tree 33 26 0 7 - Table 3.
The reported use of sprays by commercial arborists in 1982 to control insects or diseases, and the ranking of relative importance within each.
Use frequency (no. arborists) Relative importancea Problem First Second Third Diseases Anthracnose 11 6 5 9 Blights 14 5 3 3 Canker or dieback 7 2 1 3 Galls 14 1 3 0 Leaf spots 19 2 5 4 Powdery mildew 14 2 2 4 Rust 13 4 11 5 Scab 11 14 5 6 DED 12 4 3 2 Insects Aphids 28 5 10 7 Bagworms 22 10 3 3 Borers 34 7 6 4 Caterpillars 35 5 4 4 Elm bark beetles 24 1 2 3 Gallmakers 20 0 1 0 Leaf beetles 26 0 1 2 Leafminers 32 1 1 0 Leafhoppers 24 1 2 1 Mites 31 4 4 8 Moths (gypsy or tussock) 16 1 0 0 Plant bugs 19 0 0 0 Scale insects 23 10 8 6 Webworms 29 1 2 6 ↵a The number of arborists who rated this disease (or insect pest) as first, second, or third in importance in his area.
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