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Sep 01, Leaf Drop is always caused by stress of some kind.

Abnormal leaves, limited flowers and few or no berries result, reports the University of California Cooperative Extension.

Usually by Under/Over watering. My blueberry bush is still in full leaf. Defoliation of blueberry plants may be a sign of fungal infection.

For example, phytophthora root rot, caused by Phytophthora cinnamomi, is most severe during spring and fall and causes leaf. Nitrogen deficient leaves may develop early fall color and then drop off.

They like it at about 5.

Nitrogen deficiency on ‘Bluecrop’ blueberry. Plant on the left did not receive adequate nitrogen fertilizer.

Like many other plants, blueberry bushes will drop leaves in response to stress -- too much water, too little water, overfertilization, disease, etc. If the stress is severe (for example, if the soil dries out completely), it can kill the plant. Alternatively, stress can also trigger a plant to enter dormancy earlier than it might otherwise. May 29, Some of my blueberries have begun to exhibit classic signs of iron chlorosis, that is iron deficiency.

A blueberry with iron deficiency has yellowing leaves with dark green veins, the new growth will be affected by this first. Now, before you run off and bury iron nails next to your blueberry bushes one of the biggest culprits of this problem isn't that the soil doesn't Estimated Reading Time: 2 mins.

Oct 13, It is hard to say exactly why your blueberry plants are defoliating (losing their leaves). Here are a couple of possibilities: When you scratched in the fertilizer, you may have scratched too deeply and damaged the roots or burnt the roots with the fertilizer. The shrub needs water ASAP. They draw more water when they are fruiting, and for whatever reason, your shrub has exhausted the available supply.

It could be that your soil is draining away the water rapidly. Our blueberry shrubs are all mulched with about 6 inches of shredded maple leaves, to help retain soil moisture. Jun 03, Valdensinia is a relatively new disease that causes early leaf drop and low plant vigor.

No matter the fungal organism, most types of blueberry leaf spot occur during wet periods. The moisture causes the overwintered spores to flourish and spread.