two weeks after application. Banvel (dicamba) : Usage limitations for dairy animals 

 and hay harvest vary with the rate. If 16 ounces (1 quart) is used, do not let 

 dairy animals graze for 21 days or harvest for hay before 51 days. See the label 

 for limitations on other rates. Do not let meat animals graze in treated fields 

 within 30 days. 



Alfalfa . Butozone ester , Butyrac 118 (2,4-DB): Do not graze or feed hay from 

 treated areas to livestock within 30 days. This restriction also applies to small 

 grains seeded with alfalfa and treated with 2,4-DB. Princep (simazine) : Do not 

 graze for 30 days or harvest for hay for 60 days. 



Sunflowers . Amiben (chloramben) : Do not graze or feed forage to livestock. 



PREPLANT CORN HERBICIDES 



During the spring rush, remember these precautions: (1) minimum tillage and crop 

 residues on the surface will make incorporation much more difficult than usual; 

 (2) Sutan (butylate) needs immediate incorporation because it is a volatile her- 

 bicide. The volatility loss will be especially great on warm days and on wet soils. 

 Do not reduce the rates this year, especially where incorporation is less than op- 

 timum. Preplant application too far ahead of planting will decrease the length of 

 seasonal weed control. The Sutan , Sutan- atrazine , Princep , and AAtrex labels spec- 

 ify: Do not apply more than two weeks before planting. Lasso (alachlor) should not 

 be applied and incorporated more than one week before planting. Lasso and Lasso- 

 Mtrex are usually preferred as preemergence applications , unless you are trying to 

 control nutsedge. 



NEW CLEARANCES AND FORMULATIONS 



Basargran (bentazon) has received an experimental permit for 1973 usage as a post- 

 emergence herbicide in soybeans. An experimental permit allows a company to sell 

 a limited amount of material for field usage, but they must keep certain records 

 on usage and performance and report these data to the EPA before full clearance. 

 (Note: Rate and timing information will be published in a later issue.) 



Princep 4L (simazine) is a new, 4-pound-per-gallon suspension for preplant or pre- 

 emergence use in corn. Liquid formulations such as Princep 4L and AAtrex 4L of- 

 fer the advantages of easier mixing with water and the possibility of using a 

 lower water volume, but have the disadvantage of a higher price than the wettable 

 powder formulations. 



CORRECTION 



In the March 30 issue of this Bulletin and in the Custom Spray School Manual, the 

 postemergence rate for Bladex was erroneously listed as 1-1/2 to 2 pounds per acre 

 of Bladex 80W. The rate should be 1-1/2 to 2-1/2 pounds per acre of Bladex 80W for 

 postemergence use. Use the high rate when drought conditions prevail; but, use only 

 the low rate on very light sandy soils. 



PLANT DISEASE 



"MOLD SICKNESS" (RESPIRATORY PROBLEMS) 



Several grain handlers and farmers have recently reported choking, shortness of 

 breath, fainting, high temperatures, and other respiratory discomfort when clean- 

 ing musty grain storage bins or moving corn out of storage. High humidity from 



