3 Blueberries
Contents
3.1 Introduction.. 1
3.2 Insects and Diseases: Time for Concern.. 3
3.2.1 DORMANT. 3
3.2.1.1 Insect Stem Gall 3
3.2.1.2 Botrytis Blossom and Twig Blight 3
3.2.1.3 Fusicoccum Canker 3
3.2.1.4 Phomopsis Canker 3
3.2.1.5 Scale Insects. 4
3.2.2 GREEN TIP.. 4
3.2.2.1 Mummyberry. 4
3.2.2.1 Mummyberry (continued) 4
3.2.2.2 Botrytis Blossom and Twig Blight 5
3.2.2.3 Phomopsis Canker 5
3.2.3 PINK BUD.. 5
3.2.3.1 Mummyberry. 5
3.2.3.2 Botrytis Blossom and Twig Blight 6
3.2.4 BLOOM.. 6
3.2.4.1 Mummyberry. 6
3.2.4.2 Botrytis Blossom and Twig Blight 6
3.2.4.3 Anthracnose Fruit Rot 6
3.2.4.4 Blueberry Leaf Rust 7
3.2.4.5 Powdery Mildew.. 7
3.2.5 PETAL FALL. 8
3.2.5.1 Cranberry Fruitworm.. 8
3.2.5.2 Cherry Fruitworm.. 8
3.2.5.3 Leafrollers. 9
3.2.5.4 Blueberry Tip Borer 9
3.2.5.5 Plum Curculio. 9
3.2.6 POST BLOOM.. 9
3.2.6.1 Cranberry Fruitworm.. 9
3.2.6.2 Cherry Fruitworm.. 9
3.2.6.3 Leafrollers. 9
3.2.6.4 Blueberry Tip Borer 9
3.2.7 SUMMER PREHARVEST. 9
3.2.7.1 Blueberry Maggot 9
3.2.7.2 Japanese Beetle. 11
3.2.7.3 Anthracnose Fruit Rot 11
3.2.7.4 Blueberry Stem Borer 11
3.2.8 SPECIAL PESTS.. 11
3.2.8.2 Witches’ Broom.. 11
3.3 Weed Management. 11
3.1 Introduction
Numerous pests affect blueberries, although the pest complex
is much narrower than with many other fruit crops. For photographs of these
pests and for detailed information on blueberry culture, obtain a copy of the Highbush Blueberry Production Guide (NRAES-55) from your
Cornell Cooperative Extension Office or order on line at: http://www.nraes.org/
.
For assistance with diagnosing blueberry problems, use the
Berry Diagnostic Tool at http://www. hort.cornell.edu/diagnostic or contact
your Cornell Cooperative Extension Office for assistance. To submit samples for
disease diagnosis, contact Plant Disease Clinic, Cornell University, Department
of Plant Pathology, 334 Plant Science Building, Ithaca, NY 14853-4203, (607)
255-7850, http://plantclinic.cornell.edu.
To submit samples for insect diagnosis or for phone
consultations, contact Insect Diagnostic Laboratory, Cornell University,
Department of Entomology, 4140 Comstock Hall, Ithaca, NY 14853-2601, (607)
255-3250, http://www.entomology.cornell.edu/Extension/DiagnosticLab.
The following information is provided for management of
blueberry pests. If a pesticide is used, it must be registered with the state
and federal governments. Use Table 3.2.1 to determine legal pesticides, their
brand names, and any restrictions that may apply. Unless otherwise noted, use 100 gal water per acre. Always read the label before
applying any pesticide.
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Table 3.1.1. Blueberry pests and the associated
stage of plant development.
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Stage of development
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Scout for:
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See section:
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Dormant
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Insect stem
gall,
Botrytis blossom and twig blight
Cankers (Fusicoccum
and Phomopsis)
Scale insects
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3.2.1.1
3.2.1.2
3.2.1.3 and 3.2.1.4
3.2.1.5
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Green tip
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Mummyberry
Botrytis blossom and twig blight
Phomopsis canker
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3.2.2.1
3.2.2.2
3.2.2.3
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Pink bud
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Mummyberry
Botrytis
blossom and twig blight
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3.2.3.1
3.2.3.2
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Bloom
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Mummyberry
Botrytis blossom and twig blight
Anthracnose fruit rot
Blueberry leaf rust
Powdery
mildew
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3.2.4.1
3.2.4.2
3.2.4.3
3.2.4.4
3.2.4.5
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Petal
fall/Post bloom
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Cranberry fruitworm
Cherry fruitworm
Leafrollers
Blueberry tip borer
Plum curculio
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3.2.5.1
3.2.5.2
3.2.5.3
3.2.5.4
3.2.5.5
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Summer preharvest
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Blueberry maggot
Japanese beetle
Anthracnose fruit rot
Blueberry
stem borer
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3.2.7.1
3.2.7.2
3.2.7.3
3.2.7.4
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Special pests
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Witches’ broom
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3.2.8.1
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Table 3.1.2. Chemical and brand names of labeled
fungicides, insecticides, and miticides for
blueberries.
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(DTH= days to harvest; REI=
Restricted Entry Interval)
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Chemical Name
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Brand Name/Formulation
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EPA Reg. Number
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Restrictions
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*azinphos-methyl
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*Guthion
50WP
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264-733
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DTH = 7, REI = 7 days
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azoxystrobin
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Abound 2.08F
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100-1098
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DTH = 0, REI = 4 hr
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Bacillus thuringiensis
(B.t.)
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Javelin WG
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70051-66
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DTH = 0, REI = 4 hr
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Deliver
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70051-69
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Dipel DF
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73049-39
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captan
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Captan 50WP
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51036-166
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DTH = 0, REI = 96 hr
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Captan 80WP
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51036-168
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DTH = 0, REI = 72 hr
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Captec 4L
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51036-181
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DTH = 0, REI = 72 hr
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Many others
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captan/fenhexamid
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Captevate
68WDG
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66330-48
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DTH = 0, REI = 72 hr
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carbaryl
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Sevin 4F
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264-349
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DTH = 7, REI = 12 hr
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*Sevin
80WSP
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264-526
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Sevin XLR
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264-333
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Carbaryl
80S
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19713-50
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Carbaryl 4L
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19713-49
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DTH = 7, REI = 12 hr
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Carbaryl 4L
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347 |