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Describes the life cycle and injury symptoms of grape phylloxera, Daktulosphaira.

Aug 27, The Lilac borer (or ash borer, a type of clearwing borer moth) tunnels into lilac branches. Signs include sawdust, sap and frass (excrement).

Some plants tolerate this damage. Others experience dieback of branches and sometimes death of the entire plant. People are unlikely to notice them. Sudden Lack of Leaves on a Lilac Bush. Common lilacs (Syringa vulgaris) are hardy shrubs that suffer few disease or pest problems.

They grow best when planted in full sun with well-draining. Mar 31, Your bush might have a bacterial plant disease called lilac blight.

A cool, wet, rainy, spring season favors development of lilac blight, especially if rains follow a late frost or winter injury. Oregon State University Extension plant pathologists are Estimated Reading Time: 5 mins. Step 5. Fertilize the lilac bush. Use a fertilizer with a nitrogen-phosphorous-potassium ratio on older plants that are not blooming.

You may also use a or fertilizer. Fertilize once in the spring and once in the fall by digging a few holes in the soil next to each lilac plant and adding 1 cup of fertilizer to each hole. Jul 24, A dying lilac bush may appear weak or yield only a few spring blooms.

Pests like aphids or ladybugs can destroy the foliage on your lilac, which can kill it over time.

Rake away any dead branches and leaves, along with mulch, from the base when you notice the bush looks unhealthy in early spring after the growing season begins. Generally, you want the pH level to be aroundbut it is acceptable for lilac bush soil to be one-tenth of a point or so higher than that. The plant may also be more prone to diseases that affect leaves.

Agricultural researcher and hybridizer Walter Lammerts developed the first"low-chill" lilacs in the s. Today, more than Sep 06, To prune your lilac bush, remove any small suckers near the base of the stems. To control the height your lilac grows to, trim canes back to eye height. You should also trim off about 1/3 of the inner branches or canes.

This will help to prevent lilac plant leaves becoming too dense and will allow air to circulate. Propagating Lilac Shrubs. May 23, Q. Lilac Problem - I have a Lilac bush that flowers but only has a half a side of green leaves.

Q. Lilacs - My lilacs were obtained from pulling some roots from someone else's trees 3 to 4 years ago. They will not Q. Lilac Bush Full Of Buds But Never Blooms - We have a very large, old lilac bush.