Host: flue-cured tobacco (Nicotiana tabacum (flue-cured type)
Description: Calcium (Ca)deficiency seldom occurs under field conditions, but some varieties cannot supply sufficient Ca to buds and young leaves during periods of rapid growth even though soil Ca is adequate for normal growth of other varieties. Initially, Ca deficient buds are twisted with downward curling of leaf margins and downward hooking of leaf tips. As leaf expansion continues, these symptoms become more pronounced, with separations of margin tissue which give the leaf a scalloped appearance. Tip and margin tissues become chlorotic and tips cease growing, giving the leaf a stubby appearance. Ca deficient leaves are thicker and sometimes greener than normal leaves. Symptoms become progressively less pronounced on older leaves and seldom occur at the lower stalk positions.
Image type: Field
Image location: United States
Name: R.J. Reynolds Tobacco Company Slide Set
Organization: R.J. Reynolds Tobacco Company
Country: United States