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Crop rotation is an effective method for reducing nematode population since this pest has a small host range.
If possible, plant only in club-root-free soils, but when in doubt, it is Casuzl to treat. Symptoms: A marginal necrosis of internal leaves. Weed hosts are dock, knotweed, lambsquarters, mustard, nightshade, purslane, saltbush and red root. The tissue becomes soft and mushy, and within a few days the affected plant part may collapse. Crucifer crops include cabbage, cauliflower, broccoli, kale, kohlrabi, Brussels sprouts, Chinese cabbage, all mustards, turnips, rutabagas, radishes etc.
Irrigate in the morning. In some cases, the seedling may continue to grow even though the lesion has girdled the stem. Many plants wilt and die. Eats holes in foliage. The girdled seedling eventually dies. As plants mature they fall sideways from lack of root anchorage.
Soil samples should show adequate base saturation and adequate levels of calcium. Development of the disease may stop in unfavorable weather only to begin when conditions are favorable.
Row spacings and plant densities vary to achieve head size depending on the market and to suppress weeds. Seed samples 10, seeds from each lot should be assayed for the presence of P. Contaminated seed can be cleaned by hot water seed treatment of F for 30 minutes.
Frequently they have a dense system of secondary roots, called a hairy-root condition. Low levels of seed infection coupled with weather favorable for disease spread in eastern seedbeds has caused extremely severe losses. Where Pythium is a problem, Anchor flowable at 1.
An increasing quantity of cabbage is now held in mechanically refrige rated storages. Holding nitrogen levels to the lowest level possible commensurate with adequate yields is helpful.
The application of lime is suggested when the soil pH is below 6. Avoid excessive irrigation.
Do not apply excessive rates of potash or other chemicals that would compete with calcium uptake. Control--Crop Fields: Use disease-free seed. Symptoms: The disease occurs for the most part above the ground level a cottony, white mold.
Soil pH over 6. The infectious spore stage matures slowly over a period of months.
Other controls and fumigants may be available. Use a precision seeder such as a Stanhay, or Gaspardo vacuum planter, to drop 2 seeds 2 inches apart every 15 inches. Add a spreader for coverage. In severely infested fields, areas of decline usually can be identified by excessive leaf wilting during hot weather. You may be liable for injury or damage resulting from pesticide use. Resis tant grasses include annual bluegrass and all fine fescues, whereas quackgrass can be suppressed.
Delay planting as long as possible to avoid cold, moist soils, which favor disease development.
Larvin - 0. Water stress followed by a period of excessive growth and low humidity is conducive to development of tip burn.
When the root systems are examined, lateral roots are absent or entirely decayed. When lifted, transplants should not be dipped into water before transplan ting. Choice of insecticide is de- Phosdrin - 0.