. Insects affecting vegetables [microform]. Légumes; Vegetables; Insect pests; Insectes nuisibles. 38 ! J! Asparagus. Rust (Puccinia asparagi). This disease is very commmi and is familiar to every grower of asparagus. It has three distinct stages. The first is known as the "cluster-cup" stage or the spring form. In this stage the spores are produced in cup-shaped pustules, which are grouped in oval clusters and are orange-yellow when mature. This stage is seldom noticed by asparagus growers. The second or summer stage. Fig. 48. Asparagus Rust. 1, attacked stem showing spore clusters;
. Insects affecting vegetables [microform]. Légumes; Vegetables; Insect pests; Insectes nuisibles. 38 ! J! Asparagus. Rust (Puccinia asparagi). This disease is very commmi and is familiar to every grower of asparagus. It has three distinct stages. The first is known as the "cluster-cup" stage or the spring form. In this stage the spores are produced in cup-shaped pustules, which are grouped in oval clusters and are orange-yellow when mature. This stage is seldom noticed by asparagus growers. The second or summer stage. Fig. 48. Asparagus Rust. 1, attacked stem showing spore clusters; 2, cluster-cup form; 3, spores from cluster-cup ; 4, spores from suiumer stage (uredo spores): 5, resting or winter spores (teleuto spores). is the one usually first noticed by the growers, and called by them the "red rust" on account of the elongated reddish-brown pustules which are seen breaking through the skin of the stem. In these pustules red- dish, one-celled spores are produced, known as uredospores. It is in the summer or "red rust" stage that the disease spreads most rapidly and appears to do the greatest amount of harm. Towards fall, or whenever the vitality of the asparagus plants is reduced, the third and final stage i4*i~. m. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bethune, Charles J. S. (Charles James Stewart), 1838-1932; Ontario. Dept. of Agriculture. Toronto : Dept. of Agriculture
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