. Insect and disease conditions in the United States, 1979-83 : what else is growing in our forests?. Forest insects United States; Trees Diseases and pests United States; Plants Disease and pest resistance. F-705644 trees that are less likely to host the budworm larvae; several States and private companies have established orchards to im- prove the planting stock. Full- scale production of superior spruce and fir seed is, unfor- tunately, several years away. In the interim, improved seed is being selected in the northeastern forests. Another prevention strategy in- volves monitoring budworm p
. Insect and disease conditions in the United States, 1979-83 : what else is growing in our forests?. Forest insects United States; Trees Diseases and pests United States; Plants Disease and pest resistance. F-705644 trees that are less likely to host the budworm larvae; several States and private companies have established orchards to im- prove the planting stock. Full- scale production of superior spruce and fir seed is, unfor- tunately, several years away. In the interim, improved seed is being selected in the northeastern forests. Another prevention strategy in- volves monitoring budworm populations with traps baited to attract male moths so that out- breaks can be detected and treated before heavy losses occur. Suppression. After the in- troduction of new electronic guidance systems, such as Loran-C, precision spraying from aircraft became a reality. Today, outbreak areas are treated with both chemical and biological insecticides. The use of biological insec- ticides continues to increase. The great advantage of the biologicals is that they are relatively harmless to other organisms and the en- vironment. The bacterium Bacillus thuringiensis () has given the best results. can now be ap- plied in lower doses than before; new spray additives and research into the timing of applications have helped to improve its effec- tiveness. Because it affects some moths and butterflies, is also. m Figure 6. Blue gray indicates trees that I have been I defoliated and | killed by spruce budworm; maroon indicates healthy conifers; bright red is healthy hard- woods and brush; bright pink indi- cates grass. F-705645. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Loomis, Robert C; Tucker, Susan; Hofacker, Thomas H; United States. State and Private Forestry; United States. Forest Pest Management.
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