C. Diseases characterized by leaf spots and spotting or decay of fruits, but no wilting of plant.
(a) Rather large, dead spots, 1/4" to 1/2" in diameter, on older leaves; spots brown with concentric rings giving a target- like appearance. Plants partially or completely defoliated (depending on physiological age and cultivars). Circular to elongate, dark spots with light centers on the stem. Seedlings may be girdled at the ground line. Fruits developing large, dark, leathery spots near stem ends, with dark, dry decay of the flesh underneath. Development favored by warm, humid conditions.................................................................................................................................Early blight
(b) Small, dark, irregular, greasy spots on leaves, about 1/8" in diameter and often tearing out. Defoliation sometimes serious. Spotting of green fruits only; small, raised, water- soaked spots, later becoming sunken and light brown, with scabby, roughened surface. Spots 1/8" to 1/4" and not extending deeply into fruit.
...........................................................................................................................Bacterial spot
(c) Numerous minute, dark spots on the leaves extending to the lower surfaces. Fruit symptoms most noticeable, consisting of very small, dark-brown, slightly raised specks less than 1/16" in diameter, scattered thickly over the surface. Frequently a dark- green halo spot can be observed. Sometimes occurring with bacterial spot (making id difficult).
.........................................................................................................................Bacterial speck
(d) Greenish-black or grayish, water-soaked patches on leaves, increasing in size rapidly and sometimes killing much of the foliage in a matter of days. Fungus growth evident on underside of the leaves as well. Water-soaked spots on fruits; spots enlarging rapidly and sometimes cover over half of the surface. Spots become brown with a firm corrugated surface. Disease spread in the wind from overwintered debris for great distances. Development favored by cool, moist conditions.
..............................................................................................................................Late blight
(e) Young leaves showing numerous small, dark, circular spots and a peculiar bronze (or purplish); such leaves sometimes turn dark and wither. Tips of young plants show dark streaks and are sometimes killed. New growth sometimes stunted. Ripe fruit showing spots about 1/2" in diameter, marked with concentric, circular bands of red and yellow. Often infections are spotty in the field but can be widespread at times. Nine species of thrips are responsible for transmission of the virus.
.......................................................................................................Tomato spotted wilt virus
Ahead to: 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