Use 2 pounds (1.6 pounds actual of 80 WP) of the fungicide at 7- to 10-day intervals 

 until the milk stage is reached. Do not graze treated areas. No more than three ap- 

 plications are allowed in any one field. See Report on Plant Diseases No. 309, "Hel- 

 minthosporium Leaf Spots and Blotches of Forage Grasses." (Copies are available 

 from the source given previously.) 



POWDERY MILDEW OF WHEAT 



Erysiphe graminis tritioi causes powdery mildew (PM) of wheat. Early season infection 

 appears as a grayish-white, cottony growth on the upper surfaces of infected plant 

 leaves. Mildew is most severe in dense stands of highly fertile fields, especially 

 those with a high nitrogen content. Knox, Knox 62, Monon, and Reed are the resist- 

 ant varieties. One sample of Benhur wheat that we received had PM on every leaf of 

 all the plants in the sample. See Report on Plant Diseases No. 104, "Powdery Mildew 

 of Wheat and Barley," for further details. 



PHYTOPHTHORA CROWN ROT OF ALFALFA 



Wet, poorly drained soils have favored the occurrence of crown rot in alfalfa by 

 Phy thophthora oryptogea. Wounds due to freeze-thaw injury also contribute to this 

 and other root rot complexes. Under very favorable conditions (periods that are 

 wet and cool) , plants may be yellow and die prematurely without stunting. See Re- 

 port on Plant Diseases No. 302, "Root and Crown Troubles of Alfalfa," for control 

 measures . 



COMMON LEAF SPOT OF ALFALFA 



Small, circular, dark-brown, raised spots caused by Pseudopeziza medioaginis have 

 been found on several alfalfa specimens received recently at the University of Illi- 

 nois Plant Disease Clinic. Although plants may be severely weakened and stunted 

 during the first year of a stand, apparently little permanent damage occurs. Flemish 

 alfalfa varieties have fairly high resistance, and Vernal is moderately resistant. 



Cutting heavily infected fields in the prebloom or bud stage before the leaves fall 

 removes the source of infection and gives later cuttings a better chance to remain 

 healthy. Dry weather also slows the progress of this disease. See Report on Plant 

 Diseases No. 301, "Leaf and Stem Diseases of Alfalfa," for more details. 



BENLATE APPROVED ON CUCURBITS 



E.I. DuPont de Nemours § Company has informed us that Benlate, a relatively new 

 fungicide which they produce, has been approved by the federal Environmental Protec- 

 tion Agency (EPA) for use on cucurbits. Benlate can be applied at one-fourth to one- 

 half pound per acre on a 7- to 14-day schedule for controlling gummy stem blight, 

 powdery mildew, and anthracnose on cucumbers, summer and winter squash, and all melons. 

 Use the higher rate of (one-half pound per acre) under conditions of severe disease 

 pressure at 7-day intervals, or as needed. Before using Benlate or any other fun- 

 gicide, read and carefully observe the cautionary statements and all other information 

 appearing on the label. 



POLYRAM CLEARED FOR APPLES 



Polyram, produced by the Niagra Chemical Division of the Food Machinery and Chemical 

 Corporation, has been cleared by the EPA for use on apples to control bitter rot, black 

 rot, Botryosphaeria rot, and brown rot. Polyram is also approved for use on apples 

 to control cedar apple rust, flyspeck, scab, and sooty blotch. 



