TULSA MASTER GARDENERS

TULSA MASTER GARDENER

TIPS

SEASONAL APPEARANCE of ORNAMENTAL and SHADE TREE PESTS

• January
• February
• March
• April
• May
• June
• July
• August
• September
• October
• November
• December

This table is a listing of the statewide average of seasonal appearances of some of the pests that attack some of Oklahoma ornamentals and trees. The actual appearance may be slightly earlier or later based on locale or unusual climatic conditions in any one year. In most cases, a pest is only listed once based on the average time of first occurrence or the peak damaging activity period of the pest. Some pests may continue to be active because of longer life spans or because of multiple generations.

This information has been extracted from "Major Horticultural & Household Insects of Oklahoma" Circular E-918 Oklahoma Cooperative Extension Service.

JANUARY

1. Few insects active. Can apply dormant oils for control of scale insects, e.g. on oak, elm, fruit trees, etc.

FEBRUARY

1. Few insects active. Can apply dormant oils for control of scale insects, e.g. on oak, elm, fruit trees, etc.

MARCH

1. Cotoneaster
   • Tent caterpillars (late month)
2. Crabapple
   • San Jose Scale (mid month)
   • Tent caterpillars (late month)
3. Dogwood
   • San Jose Scale (mid month)
4. Flowering peach
   • San Jose Scale (mid month)
   • Tent Catepillars (late month)
5. Hawthorn
   • San Jose Scale (mid month)
   • Tent Catepillars (late month)
6. Pecan
   • San Jose Scale (mid month)
7. Pyracantha
   • San Jose Scale (mid month)
8. Trifoliate orange
   • San Jose Scale (mid month)
9. Wild plum
   • San Jose Scale (mid month)
   • Tent Catepillars (late month)

APRIL

1. Arborvitae
   • Juniper Scale (late month)
2. Ash
   • Redheaded ash borer (mid month)
3. Black locust
   • Cowpea aphid (mid month)
4. Black Walnut
   • European fruit lecanium (mid month)
5. Elm
   • Elm leaf beetle (adults) (early month)
   • European fruit lecanium (mid month)
   • Elm calligrapha (adult) (mid month)
   • Elm bud sawfly (larvae) (mid month)
   • May beetles (adults) (late month)
   • Spring cankerworm (late month)
   • Elm leaf aphid (late month)
   • Woolly elm aphid (late month)
   • Smaller European elm bark beetle (adult) (late month)
6. Flowering peach
   • Spring cankerwork
7. Hackberry
   • Gall psyllids (adult) (early month)
   • European fruit lecanium (mid month)
   • Spring cankerwork (late month)
8. Hickory
   • Painter hickory borer (adult) (early month)
   • Giant bark aphid (late month)
   • Hickory bark beetle (late month)
9. Juniper
   • Juniper Scale
10. Lilac
    • Harlequin bug (adult)(mid month)
11. Mulberry
    • European Fruit lecanium (mid month)
12. Oak
    • Gall wasps (adult) (early month)
    • Oak lecanium (mid month)
    • Obscure scale (mid month)
    • Spring cankerworm (late month)
    • Forest tent catepillar (late month)
    • May beetles (adults) (late month)
    • Giant bark aphid (late month)
    • Oak leaf aphids (late month)
13. Pecan
    • Obscure scale (mid month)
    • European Fruit lecanium (mid month)
    • May beetles (adults) (late month)
    • Giant bark aphid (late month)
    • Phylloxera (late month)
14. Pine
    • Pine tortoise scale (early month)
    • Nantucket pine tip moth (adult) (All month)
    • Pine needle aphids (mid month)
15. Redbud
    • Redbud aphid (early month)
    • European Fruit lecanium (mid month)
16. Sumac
    • Sumac leaf beetle (late month)
17. Sycamore
    • Giant bark aphid (late month)
18. Wild plum
    • Rusty plum aphid (late month)
    • Spring cankerworm (late month)
19. Willow
    • Willow leaf beetle (adult) (mid month)

MAY

1. Arborvitae
   • Spider mites (early month)
   • Bagworm (late month)
2. Ash
   • sawfly (larvae)(early month)
   • ash borer (adult)(mid month)
   • ash leafcurl aphid (mid month)
   • carpenterworm (mid month)
3. Birch
   • oystershell scale (early month)
4. Black locust
   • sawfly (larvae) (early month)
   • carpenterworm (mid month)
5. Boxelder
   • Boxelder aphid (early month)
   • carpenterworm (mid month)
6. Bald cypress
   • bagworm (early month)
7. Cottonwood
   • carpenter worm (mid month)
   • cottonwood twig borer (adult)(late month)
8. Crabapple
   • Forbes scale (early month)
   • spirea aphid (late month)
9. Eastern red cedar
   • bagworm (larvae)(early month)
   • Fletcher scale (mid month)
   • bagworm (larvae) (late month)
   • sawfly (larvae) (late month)
10. Elm
    • Elm lace bug (early month)
    • carpenterworm (mid month)
    • Elm calligrapha (larvae) (mid month)
    • Elm leaf beetle (larvae) (mid month)
    • elm scurfy scale (mid month)
    • elm borer (adults)(late month)
11. Euonymus
    • euonymus scale (crawlers)(early month)
12. Flowering quince
    • Spider mites (mid month)
    • melon aphid (late month)
13. Hawthorn
    • oystershell scale (early month)
14. Honey locust
    • honey locust pod gall (early month)
15. Honeysuckle
    • hornworm (mid month)
16. Juniper
    • Juniper webworm (mid month)
    • bagworm (larvae) (late month)
    • spider mites (late month)
17. Lilac
    • lilac borer (adult)(mid month)
18. Maple
    • painter maple aphid (mid month)
    • wooly alder aphid (mid month)
    • carpenterworm (mid month)
19. Mimosa
    • mimosa webworm (mid month)
20. Oak
    • linden looper (early month)
    • pinoak sawfly larvae)(early month)
    • leafrollers (mid month)
    • carpenterworm (mid month)
    • Kermes scale (mid month)
21. Pecan
    • blackmargined aphid (early month)
    • sawflies (larvae)(late month)
    • black pecan aphid (late month)
22. Pine
    • black turpentine beetle (adult) (mid month) (S.E. Okla only)
    • pales weevil (adult) (mid month) (S.E. Okla only)
    • sawflies (larvae) (late month)
23. Privet
    • whiteflies (early month)
24. Pyracantha
    • Forbes scale (early month)
25. Redbud
    • Redbud leafroller (late month)
26. Spirea
    • spirea aphid (late month)
27. Sycamore
    • sycamore lace bug (early month)
28. Willow
    • giant willow aphid (early month)
    • sawflies (larvae) (early month)
    • willow leaf beetle (larvae) (early month)

JUNE

1. Birch
   • birch aphid (early month)
2. Black walnut
   • flatheaded apple tree borer (adult) (early month)
   • fall webworm (mid month)
   • walnut catepillar (late month)
3. Boxelder
   • Boxelder bug (early month)
4. Catalpa
   • catalpa sphinx (larvae) (early month)
5. Cotoneaster
   • hawthorn lace bug (early month)
6. Cottonwood
   • cottonwood leaf beetle (adult)(mid month)
   • fall webworm (mid month)
   • cottonwood borer (adult) (mid month)
   • cloudywinged leaf aphid (late month)
7. Crabapple
   • flatheaded appletree borer (adult) (early month)
   • spirea aphid (late month)
8. Dogwood
   • flatheaded appletree borer (adult) (early month)
9. Eastern red cedar
   • minute cypress scale (mid month)
10. Elm
    • Elm sawfly (larvae) (early month)
    • flatheaded appletree borer (adult) (early month) )
11. Flowering peach
    • peachtree borer (adult) (early month)
12. Goldenrain tree
    • boxelder bug (early month)
13. Hawthorn
    • hawthorn lace bug (early month)
14. Hickory
    • flatheaded appletree borer (adult) (early month)
    • fall webworm (mid month)
    • walnut caterpillar (late month)
15. Holly
    • leafminer (larvae) (early month)
16. Lombardy poplar
    • poplar borer (adult) (early month)
    • cottonwood borer (adult) (mid month)
17. Maple
    • cottony maple scale (early month)
    • flatheaded appletree borer (adult) (early month)
18. Oak
    • flatheaded appletree borer (adult) (early month)
    • oak lace bug (early month)
    • oak grasshopper (mid month)
19. Pecan
    • flatheaded appletree borer (adult) (early month)
    • fall webworm (mid month)
    • walnut caterpillar (late month)
20. Persimmon
    • false cottony maple scale (early month)
    • fall webworm (mid month)
21. Pine
    • pine needle scale (mid month)
    • southern pine sawyer (adult) (mid month)
22. Pyracantha
    • hawthorn lace bug (early month)
23. Redbud
    • flatheaded appletree borer (adult) (early month)
24. Sumac
    • sumac aphid (mid month)
25. Sweetgum
    • sweetgum pit scale (mid month)
26. Sycamore
    • flatheaded appletree borer (adult) (early month)
27. Willow
    • black willow aphid (early month)
    • cottonwood borer (adult) (mid month)

JULY

1. Black walnut
   • American walnut aphid (mid month)
2. Eastern red cedar
   • spider mites (early month)
3. Holly
   • grasshoppers (mid month)
4. Juniper
   • spider mites (early month)
5. Oak
   • oak eriococcus (mid month)
   • spider mites (mid month)
6. Privet
   • hornworms (mid month)
   • spider mites (late month)
7. Sycamore
   • sycamore tussock moth (larvae)(early month)
8. Willow
   • black willow aphid (early month)

AUGUST

1. Ash
   • lace bugs (early month)
2. Elm
   • spider mites (late month)
3. Euonymus
   • spider mites (early month)
4. Mulberry
   • spider mites (early month)

SEPTEMBER

1. Ash
   • fall ash borer (adult)(late month)
   • ash bark beetle (adult) (late month)
2. Black locust
   • walkingstick (early month)
3. Black walnut
   • twig girdler (adult) (mid month)
4. Dogwood
   • whitebanded dogwood aphid (late month)
5. Elm
   • twig girdler (adult) (mid month)
6. Hickory
   • twig girdler (adult) (mid month)
7. Oak
   • walkingstick (early month)
   • yellownecked caterpillar (mid month)
   • variable oakleaf caterpillar (mid month)
   • dark oak scale (mid month)
8. Pecan
   • twig girdler (adult) (mid month)
9. Persimmon
   • twig girdler (adult) (mid month)

OCTOBER

1. Arborvitae
   • arbovitae aphid (mid month)
2. Black locust
   • locust borer (adult) (early month)
3. Pine
   • pine bark aphids (early month)
   • spider mites (late month)
4. Spruce
   • spider mites (late month)

NOVEMBER & DECEMBER

1. Pine
   • Nantucket pine tip moth--This is the best period of time to apply systemic insecticide to the soil around susceptible species of pines.

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