Diseases of truck crops Diseases of truck crops / Ralph E. Smith diseasesoftruckc119smit Year: 1940 60 California Agricultural Extension Service [CiR. 119 green blisters on stems and leaf bases and water-soaked, oily spots npon pods and leaves in this bacterial infection, which usually follows cold, wet weather and frost injury. These blisters, especially on leaves, dry down into brown, dead spots and the stem may be girdled. Healthy shoots sometimes spring up from below. The disease, caused by Pliy- Fig. 28.—Ascocliyta bliglit of pea plants. tomonas pisi, is seed-borne. The use of clean
Diseases of truck crops Diseases of truck crops / Ralph E. Smith diseasesoftruckc119smit Year: 1940 60 California Agricultural Extension Service [CiR. 119 green blisters on stems and leaf bases and water-soaked, oily spots npon pods and leaves in this bacterial infection, which usually follows cold, wet weather and frost injury. These blisters, especially on leaves, dry down into brown, dead spots and the stem may be girdled. Healthy shoots sometimes spring up from below. The disease, caused by Pliy- Fig. 28.—Ascocliyta bliglit of pea plants. tomonas pisi, is seed-borne. The use of clean seed from healthy fields and crop rotation are the best methods of control. Cladosporium Leaf Spot, Scab.—Leaves, stems, and pods are some- times marked with dark-colored spots which in moist weather are cov- ered with velvety mold of the fungus Cladosporitcni insicola. The leaves become curled and twisted and the pods very much deformed and roughened. Sometimes the fungus penetrates the pod and forms mold growth on the inner surface and on the young seeds. Crop rotation is advisable where this disease occurs. Seed from af- fected fields should not be used for planting since the disease is seed- borne. Downy Mildew.—Affected leaves curl downward and show yellow- ing from above; a violet-colored fungus, Peronospora viciae, covers the
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