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II. Apple Insects
D.L. Horton, J.D. Dutcher, HC Ellis
Georgia's 1996 apple crop was valued at $3.68 million, from 21
million lbs of fruit which averaged $0.175/lb. There are an estimated 390,000 bearing
trees in Georgia.*
Extreme spring cold resulted in a variable crop, but most blocks
cropped well enough to receive season-long insecticide programs. Acreage typically
received pesticide applications for San Jose scale, rosy apple aphid, plant bugs,
leafminers, leafhopper, codling moth, leafrollers and mites. Pheromone trapping suggested
an increase in tufted bud moth pressure. Control of tufted bud moth was variable, but
efficacy in "problem" blocks appeared to improve when timing was refined with
pheromone monitoring. Control cost estimates reflect only the estimated cost of materials.
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*Georgia Farm Report. 1997. Volume 97, Number 02.
Estimates of Losses and Control Costs
Rank |
Insect |
Cost of Control |
Damage |
Total |
1 |
Leafrollers1 |
$122,000 |
$72,000 |
$194,000 |
2 |
Codling moth |
125,000 |
11,000 |
136,000 |
3 |
European red mite3 |
19,000 |
20,000 |
39,000 |
4 |
Aphids2 |
9,000 |
15,000 |
24,000 |
5 |
San Jose scale |
11,000 |
10,000 |
21,000 |
6 |
Plant bugs |
5,000 |
3,000 |
8,000 |
| |
Total |
$291,000 |
$131,000 |
$422,000 |
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1. Primarily tufted apple budmoth.
2. Primarily the rosy apple aphid.
3. Primarily the European red mite, with some two-spotted spider mite. |
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Information Pertaining to Control of Major Apple
Insect Pests in Georgia in 1996 |
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Insects Control |
No. Units Needing Control |
No. Unit Treated |
No. of Unit Applic.1 |
Avg. Cost Per Unit Treated |
Yield Loss on Units Treated2 |
Yield Loss on Units
Untreated2 |
Leafrollers |
390,000 |
371,000 |
3.0 |
$0.11 |
399,000 |
0 |
Codling Moth |
390,000 |
390,000 |
4.0 |
$0.08 |
63,000 |
0 |
European red mite3 |
156,000 |
156,000 |
1.0 |
$0.12 |
59,000 |
52,000 |
Aphids4 |
126,000 |
105,000 |
1.0 |
$0.09 |
28,000 |
56,000 |
San Jose scale |
420,000 |
357,000 |
1.0 |
$0.03 |
58,000 |
0 |
Plant bugs |
78,000 |
59,000 |
1.0 |
$0.09 |
16,000 |
0 |
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1 Excluding application costs
2 Yield units measured in pounds
3 Primarily the European red mite, with some two-spotted spider mite
4 Primarily the rosy apple aphid |
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