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Johnson Grass,
*A Typhoid Mary*
Johnson grass is widespread throughout the state and was found in Rappahannock last week. In general apperance it closely resembles Sudan grass, however, it caj\ be destinguished by the presence of underground stems (rhizomes) found on the roots simi lar to those common to Bermuda and Quackgrass. Johnson grass causes severe damage in two ways. As a weed pest, it greatly reduces yields of most crops and also acts as an overwinter host for the virus which causes MAIZE DWARF MOSIAC; therefore if is a disease carrier or “Thyphoid Mary" Maize Dwarf Mosiac first found to exist in Virgina in 1963, was discovered in neigh boring Culpeper County last year. This disease has been known to reduce corn yields up to 80% depending upon the stage of maturity of the corn when infection takes place and how widespread the disease is within the crop boundary. Maize Dwarf Mosiac causes severe stunting of corn plants when attacked early in the season (June) as no ear forms. Also, there will be reddening of the corn blades and / or a mottled appearance.
Grain yields are also reduced and plants stunted when infection takes place later in the season ( late July early August) but not to the extent when infection takes place early.
90.2%