Vespula pennsylvanica / maculiforna / germanica / vulgaris / squamosa and DolichovespulaThe dog days of summer…fresh water melon, ice cream, p
06.06.2023 - 19:38 / gardenerspath.com / Helga George
What Is Purple Spot of Asparagus? Pleospora herbarumPurple spot is an asparagus disease that can infect between 60 and 90 percent of the new spears when conditions are right.
Most prominent in cool weather, it typically subsides when conditions become dry.
The disease manifests as small, superficial, reddish-purple lesions on the lower half of new spears. In addition, tan to brown lesions can form on the needle-like leaves of the ferns.
Fortunately, affected plants are edible, and the spots disappear during cooking.
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But you should still take steps to protect your crops, and treat them if needed. This disease can predispose asparagus plants to crown rot and result in an early death.
Read on to learn how to control this disease.
Life CycleYou may not know that fungi can alternate between sexual and nonsexual stages. They produce different kinds of spores, look like entirely different organisms, and are named differently!
This is highly relevant to gardening, because the spores produced by these two stages can infect the plants differently.
The disease is most intense when debris from the previous year’s fern growth is lying around on the surface of the soil. This is a particular problem when no-till cultural systems are used.
Fungi in the sexual stage (Pleospora herbarum) live on that debris, and it is ready to infect the new spears when wet weather strikes in the spring.
Fungi at this stage produce ascospores that live within a sac-like structure called an ascus. These asci are produced in structures called pseudothecia that look like small black dots on the asparagus debris.
These ascospores infect the spears as soon as
Vespula pennsylvanica / maculiforna / germanica / vulgaris / squamosa and DolichovespulaThe dog days of summer…fresh water melon, ice cream, p
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