Mat, 1020] PATHOLOGY 237 



1659. SCHOEVBBB, T. A. C. Het krullen van tomatenbladeren. [The rolling of tomato 

 leaves.) Tijdschr. Plantenz. 25 (Bijblad) : 11-12. 1919.— The author calls attention to the 

 frequent rolling of the lower leaves of tomato plants and points out its similarity to the leaf 

 roll of potatoes. Quanjer has shown that the stems of leaf-rolled tomato plants are free 

 from phloem necrosis. The author believes, however, that the rolling of the leaves results 

 in both cases from the abnormal accumulation of reserve food stuffs in the haves; in case 

 of the potato as a result of the destruction of the phloem; in the tomato from severe pruning 

 which eliminates the food-assimilating structures, the young shoots. This conclusion is 

 supported by an experiment in which the author grew twelve tomato plants six of which 

 were pruned in the usual manner. The leaves of the pruned plants were strongly rolled 

 while the unpruned plants showed no trace of rolling in their leaves.—//. //. Whelzel. 



16G0. Smith, R. C. Ear worm injuries to corn and resulting losses. Jour. Econ . Entomol. 

 12: 229-233. PI. 11. 1919.— Brief mention of progress of silking of corn ears, with reference, 

 is made; also mention, with reference, to bacterial and mold activity in corn ear following 

 the work of the corn ear worm (Chloridea obsoleta) and the effect produced on live-stock 

 that had eaten grains thus affected. — A. B. Massey. 



1661. Stevens, Neil E., and Fred W. Morse. The effect of the endrot fungus on 

 cranberries. Amer. Jour. Bot. 6:235-241. 3 fig., 1 table. 1919.— The disease known as 

 endrot of cranberries, caused by Fusicoccum putrefaciens Shear, is described as to its external 

 characters and as to the course and behaviour of the fungus in the tissues of the fruit. The 

 mycelium penetrates the whole berry, except the cuticle and seeds, and the hyphae pierce 

 the cell wall and enter the cytoplasm. Chemical studies show that "the sugar content of 

 berries rotted by the endrot fungus is much lower than that of sound fruit," thus suggesting 

 that the fungus makes use of the sugar. No other constant chemical difference was observed 

 between rotted and sound fruit. — E. W. Sinnott. 



1662. Stranak, F. Beitrage zur histologischen und physiologischen Erforschung der 

 bakteriillen Krankheit der Gefassbundel der Kartoffelknollen. [Contribution toward his- 

 tological and physiological investigation of the bacterial disease of the vascular tissue of the 

 potato tuber.] Centralbl. Bakt. II, 48:520-543. 2 fig. 1918.— An account of a bacterial 

 disease of the potato, manifest by dying of the sprouts before reaching the surface of the 

 ground, stunting and dying of the tops, translucent and brownish discoloring and spotting 

 of the stem, black spotting of the vein regions of the leaves, failure to set tubers or the devel- 

 opment of tubers either entirely normal or with the vascular region partly or entirely dis- 

 colored grayish-brown to black. By analysis, healthy tubers show a higher acidity and a 

 greater percentage of magnesium, water and, in most cases investigated, of potash than 

 diseased ones; consequently, fertilizing with potash and magnesium is suggested as a possible 

 means of control. Tubers of susceptible varieties show a thinner skin, fewer layers of cork 

 cells and more often a higher water content than tubers of more resistant varieties. Bod- 

 shaped bacteria found abundantly in the darkened regions of the tubers are thought to 

 cause the disease and it is also thought that they are transmitted by way of the seed-piece. 

 — Charles R. Stevenson. 



1663. Tatjbeniiaus, J. J. Pink root of onions. Science 49: 217-218. 1919.— The dis- 

 ease is confined to the' roots only, and not to the bulb. Affected roots turn yellow, then 

 pink, and finally dry. The bulb spends its energy producing new roots which in turn become 

 affected. Hence the failure of the bulbs to reach commercial size. Average annual loss in 

 Webb County estimated at 40 per cent. The disease is caused by an apparently new patho-. 

 genie organism, to which the name Fusarium malli, n. sp. is to be applied. Results of ex- 

 periments are summarized as follows: The organism is carried with infected sets and remains 

 in the soil from year to year, attacking onions, garlic and shallot. Steam sterilizing and 

 treatment with formaldehyde at the rate of 1 pint to 20 gallons of water, per square foot 

 [So in original.] will rid the soil of the fungus. Lime will not kill the fungus in the soil. 



