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May 22, Then the fungus spreads through the roots to the healthy live oaks. Improperly maintained Spanish oaks are more likely to contract the disease from the beetles for the same reason. Additionally, no scientific data exists that says leaving at-risk oak trees unmaintained is a sensible measure for containing oak wilt in Central Texas. Jan 02, In most cases, the best time to prune oak trees is November 1 to March That’s because sap beetles, insects that spread oak wilt, are active from April to August.

These beetles sniff out the sweet smell of the oak wilt fungus on infected trees, feed on the fungus and then spread it to healthy oak trees that have fresh pruning cuts. Avoid pruning oak trees during the active growing months of April through June. The chance for developing oak wilt from the open pruning wound is a high risk.

Prune all oak varieties during the dormant winter months when the internal fluids are not actively moving through the tree. Nov 23, Never prune your oak tree in the spring time!

This is the time of year that oak trees have the greatest chance of contracting oak wilt fungus, and you really don’t want to expose your oak to that possibility. The riskiest time of year to prune your oak tree, according to some experts, is between February 1 and June bushclear.buzzted Reading Time: 5 mins.