DISEASES AFFECTING LEAVES AND STEMS, WITH OR WITHOUT SYMPTOMS ON FRUIT

D. Diseases characterized by mottling, yellowing, curling or malformation of leaflets and usually by more or less stunting of the plant; with or without symptoms on the fruit.


(a) Green or yellow mottling of leaves; some curling, malformation, and dwarfing of leaflets. Plants slightly stunted. Fruits mottled by yellow strains of the virus. (Widespread)

..........................................................................................Tomato (tobacco) mosaic virus

(b) Pronounced stunting and bushy growth of plant. Mild, green mottle of leaflets. accompanied by strange "shoestring" - like growth of the leaves. Only a few small fruits formed.

.................................................................................................Cucumber mosaic virus

(c) Plants yellowed and stunted, with abnormally erect stems. Upward rolling of leaflets exposing undersides. Veins purple and leaves are stiff and leathery. Petioles curved downward and leaflets twisted. Roots and rootlets killed and plants often dying. Few or no fruits after infection.

........................................................................................................Curly top virus

(d) Plants dwarfed, sickly, and sometimes wilt readily in dry weather; frequently killed. Roots showing swelling or galls.

..................................................................................................(root knot) Nematodes

(e) Leaflets of older leaves roll upward and inward at the margins. no yellowing or dwarfing of leaflets. Little or no stunting of plants. Fruits normal. (Pruning can encourage leaf roll, and some varieties do this as well).

..............................................................................................................Leaf roll


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