Effect of varying the nutrient supply on response of pea plants to pea leaf roll

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Abstract
Pisum sativum (cv. ‘Dark-skinned Perfection’) plants grown in perlite and supplied with nutrient solutions varied in their response to pea leaf roll depending on the Ca(NO3)2: KH2PO4 ratio. The disease had no significant effect on plants grown in high levels of Ca (NO3)2 and KH2PO4, but plants grown in low Ca(NO3)2 and high KH2PO4 were severely stunted. Nodulation was unaffected by leaf roll infection. Synergism occurred between leaf roll ;md mildew (Erysiphe polygoni) infection.