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CSU Extension - A division of the Office of Engagement. Providing trusted, practical education to help you solve problems, develop skills and build a better future.
Established 1908

Search Results for: Pine beetle

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Conifer Seed Bugs – 5.588

Print this fact sheet by W.S. Cranshaw* (7/14) Quick Facts… Conifer seed bugs are a common fall and winter nuisance in Colorado homes. They develop on seeds of various plants, particularly pines. They have a somewhat bizarre appearance and may produce a piney defensive odor when disturbed. However, they are harmless to people and do […]

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Weird Worms: Horsehair Worm and the Grasshopper Nematode – 5.610

Print this fact sheet by W. Cranshaw* (6/13) Quick Facts… Horsehair worms and the grasshopper nematode parasite, Mermis nigrescens, are both harmless to humans. Moist conditions are favorable to the development of Mermis nigrescens and highest populations develop in relatively wet, grassy areas. With very few exceptions, horsehair worms will only be found in water. […]

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Diffuse and Spotted Knapweed – 3.110

Print this fact sheet by K.G. Beck * (11/13) Quick Facts… Diffuse knapweed is a shortlived, non-creeping perennial, a biennial, or occasionally an annual that reproduces and spreads solely from seed. Spotted knapweed is a shortlived, non-creeping perennial that reproduces from seed and forms a new shoot each year from a taproot. Diffuse and spotted […]

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Weed Management for Small Rural Acreages – 3.106

Print this fact sheet by K.G. Beck * (Revised 12/13) Quick Facts… Prevention, eradication, and control are three general management strategies. Prevention is the first line of defense to keep weeds from occurring or increasing. Eradication is the removal of weeds from an area so they will not recur unless reintroduced. Control reduces a weed […]

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Spider Mites – 5.507

Print this fact sheet by W.S. Cranshaw and D.C. Sclar* (7/14) Quick Facts… Spider mites are common plant pests. Symptoms of injury include flecking, discoloration (bronzing) and scorching of leaves. Injury can lead to leaf loss and even plant death. Natural enemies include small lady beetles, predatory mites, minute pirate bugs, big-eyed bugs and predatory […]

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Managing Houseplant Pests – 5.595

Print this fact sheet by W.S. Cranshaw * (6/13) Quick Facts… Many houseplant insect problems are introduced by infested plants. Carefully check plants before purchasing and quarantine them in a separate area for a few weeks to avoid introducing new pest problems. Changes in cultural practices can help control many houseplant insects, such as fungus […]

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Grasshopper Control in Gardens and Small Acreages – 5.536

Print this fact sheet by W.S. Cranshaw and R. Hammon* (1/13) Quick Facts… Grasshoppers are the most difficult insect to control because they are highly mobile. All grasshoppers lay their eggs in soil. There are over 100 species of grasshoppers in Colorado. During periods when local outbreaks are developing, control usually involves using sprays or […]

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Stalk Borers in Colorado Field Corn – 5.537

Print this fact sheet by F.B. Peairs* (10/14) Quick Facts… Two species of stalk borers attack field corn in Colorado: European corn borer, Ostrinia nubilalis; and southwestern corn borer, Diatraea grandiosella. Yield losses from either species vary with the number of larvae per plant and plant growth stage. Some naturally occurring biological controls, including insect […]

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Protecting Trees During Construction – 7.420

Print this fact sheet by C. Dennis and W.R. Jacobi* (8/20) Revised by E. Hammond** Quick Facts… Soil compaction and grade changes adversely affect tree root health, and can lead to branch dieback and tree death. Prior to starting construction activities, evaluate existing trees in the area to see if preservation is worthwhile and feasible. […]

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Environmental Disorders of Woody Plants – 2.932

Print this fact sheet by C.E. Swift, W.R. Jacobi, M. Schomaker and D.A. Leatherman * (8/20) Revised by E. Hammond** Quick Facts… Sunscald occurs during cold, bright days in midwinter. It occurs more frequently on thin-barked trees. Wrap trees in winter to help prevent sunscald. Drought and overwatering injuries occur in deciduous and evergreen trees. […]

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