As shown in Figure 7, taking the gray leaf spot
of maize as an example, the disease and insect pests image is transformed into the two-dimensional histogram of the combination of the image of gray value and chroma value, and the image of gray and chroma value is set to 256 levels, as in [0,255].
Three diseases, southern corn leaf blight, northern leaf blight, and gray leaf spot
, all cause lesions on corn leaves.
Gray leaf spot
has been particularly damaging on golf courses (Figure 16-18).
That area stays damp longer than the plant's high branches, and the leaves down there are getting old--two factors that make them prime victims for early blight (dark brown patches) or several other leaf spot diseases, including gray leaf spot
and Septoria leaf spot.
GRAY LEAF SPOT
has rapidly become one of the most important diseases of perennial ryegrass (Lolium perenne L.) in United States since its identification (Dernoeden, personal communications, 1986; Landschoot and Hoyland, 1992).
Crop disease incidence on crops with compost amendments compared to untreated control Year Crop Disease Goat manure compost 1997 turnip seedling damping off increased(*) 1997 radish petiole rot (Rhizoctonia) increased(*) 1997 turnip Gray leaf spot
1995: DEKALB breeding defends against gray leaf spot
"Materials from tropical breeding crosses have been excellent sources of resistance to Fusarium, gray leaf spot
, and southern rust and of value-added traits such as unique starch properties, high protein and oil content, and silage quality.
Suggs = Helminthosporium turcicum Pass., respectively], anthracnose leaf blight (caused by Colletotrichum graminicola), gray leaf spot
(caused by Cercospora zeae-maydis Tehon & E.Y.
For example, tomato plant cultivars have various disease resistance to diseases such as verticillium wilt (V), fusarium wilt (F), fusarium races 1 & 2 (FF), nematodes (N), tobacco mosaic virus (T), alternaria stem canker (A), and stemphylium gray leaf spot
Agriculture loses billions of dollars annually to plant diseases, such as head blight of wheat, gray leaf spot
in corn, and fire blight of apple, as well as threats to animals such as bovine virus diarrhea and porcine reproductive and respiratory disease.