Wood Mulch and Tree Health Quiz

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Wood Mulch and Tree Health Quiz

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Reference: Wood Mulch and Tree Health Fact Sheet.

1) When mulching, use four inches of mulch on heavier, clay soils and use two inches of mulch on lighter, sandy soils.(Required)
2) Keep mulch at least four inches away from the trunks of trees. Having mulch in direct contact with trunks can promote environmental conditions that are more favorable for development of bark decay.(Required)
3) Using excessively thick mulch layers can contribute to problems with root rots.(Required)
4) Incompletely composted mulches (sour mulches) can lead to nutrient toxicities in plants.(Required)
5) Sour mulches can produce gases that can lead to leaf yellowing and browning.(Required)
6) Termites are commonly associated with mulch use in Wisconsin, particularly in northern Wisconsin.(Required)
7) Carpenter ants commonly colonize wood mulch and use mulch as a food source.(Required)
8) Earwigs, sowbugs and millipedes can feed on organic matter in mulches, but these organisms are typically nuisance pests.(Required)
9) You should avoid using mulches produced from trees suffering from Verticillium wilt, because this mulch can potentially be a source of the fungus that causes the disease.(Required)
10) Mulches produced from oaks suffering from oak wilt and elms suffering from Dutch elm disease are not likely to be sources of the pathogens that cause these diseases. However, there is no scientific literature that specifically addresses the risk of using these types of mulch.(Required)