Replay of segment 2 of The Wisconsin Vegetable Gardener Radio Show from 5-25-19
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In segment 2 Joey and Holly talk about what are nematodes:
Often referred to as roundworms, nematodes are not closely related to true worms. They are multicellular insects with smooth, unsegmented bodies. The nematode species that feed on plants are so tiny that you need a microscope to see them. The adults often look long and slender, although some species appear pear-shaped. These plant parasites are not the same roundworms as the filarial nematodes that infect the human body, spread diseases, and wreak havoc on the immune system.
Some nematodes feed on the outer surfaces of a plant while others burrow into the tissue. Soil-dwelling nematodes are the most common culprits, but some species can damage plant roots, stems, foliage, and flowers.
No matter where they feed, these tiny worms can seriously damage to crops with their sharply pointed mouths by puncturing cell walls. The real damage occurs when a nematode injects saliva into a cell from its mouth and then sucks out the cell contents. The plant responds to the parasitic worms with swelling, distorted growth, and dead areas. Nematodes can also carry viruses and bacterial diseases inject them into plants. The feeding wounds they make also provide an easy entrance point for bacteria and fungi.
Beneficial nematodes that enrich the soil may feed on the decaying material, insects, or other nematodes.
What Nematodes Look Like
Unlike most other disease-causing organisms, plant-parasitic nematodes seldom produce any characteristic symptoms. Most of the symptoms that do appear are vague and often resemble those caused by other factors — such as viruses, nutrient deficiencies, or air pollution. Nematodes feeding aboveground may cause twisted and distorted leaves, stems, and flowers.
If nematodes are feeding on the roots, a plant may look yellowed, wilted, or stunted and infected food crops will usually yield poorly. If you suspect worm injury to roots, carefully lift one of the infected plants and wash off the roots for easier inspection. If nematodes are causing damage, you may see small galls or lesions, injured root tips, root rot, or excessive root branching.
How They Spread
Whether they feed above or below ground, most nematodes spend at least part of their life cycle in the soil. While they can’t move very far under their own power, they can swim freely in water and they move more quickly in moist soil — so it's a good idea to keep your soil well-drained. They also spread by anything that can carry particles of infested soil, including tools, boots, animals, and infected plants.
What About Beneficial Nematodes?
Beneficial nematodes can range from 1/25 inch to several inches long and have slender, translucent, unsegmented bodies. Their roles in the garden vary. Some are soil dwellers that break down organic matter, especially in compost piles. You can easily spot these 1/4-inch-long decomposers.
These types actually combat a variety of pest species, including weevils, clearwing borers, cutworms, sod webworms, chinch bugs, and white grubs. Nematodes attack and kill these insects by either injecting deadly bacteria or entering the host, parasitizing, and then feeding on it.
Get rid of nemotodes
Remove plants and dig up the roots at the end of each growing season to remove the nematodes' food source. Dispose of the plant matter. Till the soil after removing the plants to dry the soil and expose the nematodes to sunlight, which kills them.
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