La Junta Field Office – Insects & Diseases
The best defense against insects and diseases is to maintain a healthy tree with proper watering, proper pruning, and protecting the bark from weed-whip and lawnmower damage.
Common Insects & Diseases in Southeastern Colorado
For detailed information about maintaining healthy trees in southeastern Colorado, please read Tips for Healthy Trees – Updated August 2010 (384 KB PDF).
For more tree care information, look under Arboriculture on our Community Forestry web page.
Many of the insects and diseases listed can be found on the Colorado State University Extension website.
Tree Species Family |
CSU Extension
|
| Ash | |
|---|---|
| Ash Bark Beetle | |
| Banded-ash clearwing borer | 5.530, 1425 (Plant Talk) |
| Brownheaded ash sawfly | 5.586 |
| Carpenterworm borer | 5.530 |
| Cytospora canker | 2.937 |
| Lilac/ash borer | 5.530, 1425 (Plant Talk) |
| Sunscald | 2111 (Plant Talk) |
| Improper watering (typically under) | 2.926, 7.211 |
| Cottonwood: Native plains, hybrid cottonless) | |
| Aphids | 5.511 |
| Bacterial wetwood | 2.910 |
| Carpenterworm borer | 5.530 |
| Cottonwood borer | 5.530 |
| Cytospora canker | 2.937 |
| Fall webworm | 5.583 |
| Petiolegall aphid | 5.557 |
| Poplar borer | 5.530 |
| Poplar twiggall fly | 5.597 |
| Improper watering (typically under) | 2.926, 7.211 |
| Elms: Siberian, American, English | |
| Bacterial wetwood | 2.910 |
| Banded elm bark beetle | |
| Carpenter worm borer | 5.530 |
| Cytospora Canker | 2.937 |
| Dutch elm disease (transmitted by the lesser European bark beetle) | 5.506 |
| Elm leaf beetles | 5.521 |
| European elm scale (and associated sooty mold) | |
| Fruits, pome (crabapple, apple, pear) | 5.519, 2.800 |
| Cytospora canker | 2.937 |
| Flatheaded apple tree borer | 5.530 |
| Fireblight | 2.907 |
| Shothole borer | 5.520 |
| Sunscald | 2111 (Plant Talk) |
| Improper watering (typically under) | 2.926, 7.211 |
| Fruits, stone (cherry, plum, peach, apricot, etc.) | 5.520 |
| Apple flea beetles | 5.592 |
| Cytospora canker | 2.937 |
| Peach tree borer | 5.566 |
| Shothole borer | 5.520 |
| Sunscald | 2111 (Plant Talk) |
| Improper watering (typically under) | 2.926, 7.211 |
| Hackberry | |
| Apricot scale | |
| Hackberry nipple gall | 5.557 |
| Juniper (Eastern Red Cedar/Rocky Mountain Juniper) | |
| Flatheaded wood borer | 5.530 |
| Fletcher scale | 5.514 |
| Juniper-hawthorn rust | 2.904 |
| Spider mites | 5.507, 5.569 |
| Western cedar bark beetle | |
| Winter desiccation | 2105 (Plant Talk) |
| Locust, black | |
| Locust borer | 5.530 |
| Locust, honey | 2.939, 5.571 |
| Cankers | 2.939 |
| Honeylocust spider mite | 5.571 |
| Sunscald | 2111 (Plant Talk) |
| Improper watering (varies between over and under) | 2.926, 7.211 |
| Maple | |
| Carpenterworm borer | 5.530 |
| Girdling roots | |
| Leaf scorch | |
| Iron chlorosis | 2.928 |
| Improper watering (typically under) | 2.926, 7.211 |
| Pine, piñon | 2.948 |
| Ips bark beetle | 5.558 |
| Piñon pitchmass borer | 5.530 |
| Piñon sawfly | 2.948 |
| Piñon tip moth | 5.529 |
| Piñon twig borer | 2.948 |
| Improper watering (typically over with too frequent/shallow applications) | 2.926, 7.211 |
| Pine, ponderosa | |
| Spider mites | 5.507, 5.569 |
| Western pine tip moth | 5.529 |
| Winter desiccation | 2105 (Plant Talk) |
| Improper watering (typically under or too frequent/shallow applications) | 2.926, 7.211 |
| Walnut, black | |
| Thousand cankers disease | Pest Alert, Q&As |