j^gO] Füze als Erreger von Pflanzenkrankheifen. 269 



Die Peronospora tritt zuerst in den unbespritztfii. dann in den mit 

 Cnpraii und später in den ni't Antipevonospora und (Uiprusulfid bespritzten 

 Parzellen auf. Nach Bespritzung der Rebstöcke mit Kupferchlorid und Perocid 

 trat die Peronospora in G-egendeu, in denen sie im allgemeinen scliwacli vor- 

 kam, überhaupt nicht auf. In anderen Gegenden, wo die Peronospora stark 

 aiifgetreten war, trat sie nach Bespritzung mit 30% Lösungen ziemlich spät 

 und nur sporadisch auf. 



1210. Brigham. E. S. Powdery scab, a new potato disease. 

 (Bull. Vermont Dept. Agric. XVIII, 1914, 7 pp., 1 Fig.) 



1211. Brittoii, W. E. and CÜJiton, G. F. Spray treatmeut etc. for 

 orchards. (Bull. Connecticut Agric. Exper. Stat. New Haven 184, 1914, 

 p. 3-12.) 



1212. Brooks. Ch. Blossom-end rot of tomatoes. (Phytopatho- 

 logy IV, 1914, p. 345-374, tab. XXIV-XXVI, 5 fig.) 



Verf. berichtet über die Fäule der Tomatenfi'üchte und gibt folgende- 

 Zusammenfassung: 



1. The blossom-end rot of the tomato is not due i^rimarily to bacteria 

 or fungi. 



2. Plauts are most susceptible when in a condition of great activity. 



3. Either continued excessive watering or a sudden check in the water 

 supply may produce the disease. 



4. With liberally watered greeixhouse plants potassiuiu chloride increascs 

 the disease and lime and sodium nitrate decrease it. Thes efacts have 

 not been found to hold true under field conditions. 



5. Ammonium sulphate, dried blood and cottonseed meal have increascd 

 the disease more than sodium nitrate contaiuing an equivalent amount 

 of nitrogen. 



6. Heavy applications of horse stable manure have iucreased the disease 

 out of Proportion to the increase in vigor of the plants. 



7- When well supplied with water plants on a Sandy loam have develloped 

 less disease than those on a clay loam. 



8. Raising the soil temperature of greenhcuse plants lias iucreased the 

 disease. 



9. The writer is of the opiuion that the increase in the disease from heavy 

 watering is due to the development of harmful humie and ammonium, 

 Compounds and an aecompanying decrease in nitratcs. 



10. Susceptible tissue has more starch and more oil than normal tissue 

 and its cell sap has a higher osmotic value. 



1 1 . The protoplasm in the cells from the fruit of the heavily water ed plants 

 is more granulär and contains more oil than of the lightly watered ones. 



1213. Brooks, F. T. Some apple diseases and their treatmeut. 

 (New Hampshire Agric. Exper. Stat. Bull. Nr. 157, 1912, p. 3-32, Fig. 1-30.) 



1214. Broz, Otto. Achtung auf die schwarzbeinigen Kartoff el - 

 pflanzen. (Wiener landwirtsch. Ztg. 1914, p. 627.) 



1215. Bruiiet, Raymond. Le milxliou. (Revue de Viticult. XX, 1913, 

 p. 887.) 



1216. Brunet, R. Maladies et insectes de la vigne. Parasites 

 animaux et v^g^taux. Accidents m^teoriques et physiologiques. 

 Paris 1914, XII, 12«, 288 pp.) 



