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· A severe stem and crown disease that causes defoliation. Multiple races, including a new race 5, can be present in late season.
· Varieties are now available with multi-race high resistance.
· It occurs most often under warm, moist conditions.
· I t causes yield loss of up to 25%.
· Susceptible plants have large, sunken oval- to diamond-shaped lesions.
· Lesions can enlarge to girdle or kill plant. Girdled stems can exhibit a shepherd’s hook.
· Causes seedling stunting, reduced nodulation and poor root development.
· Race 1 is widely identified in the U.S.
· Race 2 is in more isolated areas of the Midwest, East and pockets of the Pacific Northwest.
· New race 2/3 is a more severe pathogen found in the same areas as race 2.
· Commonly found in saturated, poorly drained and/or compacted soils.
· Can be a problem in dry periods; controlled by other predators in cool and/or wet periods.
· The blue aphid is the most damaging in the Southern Plains to the Southwest.
· There are three methods to determine tolerance: the petri dish germination test, the forage greenhouse test and the field test. Salt-breeding nurseries provide varieties with more predictable performance for on-farm potential.
· Soils vary. Saline: high soluble salts. Sodic: high sodium ion content. Alkaline: soil pH that is higher than optimum (pH>8.0).
· Commonly found in the western half of the U.S.
· Small, light-green insect that feeds on alfalfa plants, causing leaf tips to display a V-shaped yellowing.
· Varieties with glandular hairs provide natural non-preference feeding for PLH.
· Commonly found in the Plains, Midwest and East; most severe in new seedings and summer regrowth that causes yield reduction.
· Microscopic roundworms (several identified species) that live in the soil, surface irrigation water, alfalfa roots and crown tissue.
· Can reduce yield and stand life and cause secondary infections from other diseases. Control them by planting a high-resistance alfalfa variety.
· Commonly found throughout most of the West and Plains.
Get the right seed for your fields by looking at the most recent agronomic information.