. Fig. 42.—The narcissus stem nematode, with young worms and eggs. (Enlarged nearly 150 times.) (From Ext. Cir. 118.) adult female, which has a white pearl-shaped body the size of a small pinhead. The sugar-beet and citrus-attacking species are very similar to the garden nematode ; leaf, bulb, and stem-attacking nematodes of a number of species occur commonly, especially on alfalfa, begonia, gooseberry, narcissus, strawberry, and other hosts. Although a great deal of work has been done in many parts of the world in trying to find some way of controlling root-knot nematodes, no practical method
. Fig. 42.—The narcissus stem nematode, with young worms and eggs. (Enlarged nearly 150 times.) (From Ext. Cir. 118.) adult female, which has a white pearl-shaped body the size of a small pinhead. The sugar-beet and citrus-attacking species are very similar to the garden nematode ; leaf, bulb, and stem-attacking nematodes of a number of species occur commonly, especially on alfalfa, begonia, gooseberry, narcissus, strawberry, and other hosts. Although a great deal of work has been done in many parts of the world in trying to find some way of controlling root-knot nematodes, no practical method has been found except to starve out the worms by grow- ing some unsusceptible crop or keeping the land clear of all vegetation for one or more years. Drying the soil tends to kill out the worms. Of the crops commonly grown in California, the various grains, including sor- ghum, milo, and Kafir, as well as wheat, barley, oats, and rye, are highly resistant and may be grown as winter crops and followed by summer- -^ For further information see: Tyler, Jocelyn. The root-knot nematode. California Agr. Exp. Sta. Cir. 330:1-34. 1933.
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Keywords: ., bookcentury1900, booksubjectagriculturalpests, booksubjectplantd
