11 



POTATO SCAB. 



It is claimed by good authorities tl)at by the use of corrosive sub- 

 limate, one ounce to eight gallons of water, in which the seed 

 potatoes are soaked, from one to one and one-half hours, Ijefore 

 planting, this disease may be prevented. We have made no experi- 

 ments in this line, but, as this disease is one of the greatest draw- 

 backs to the successful cultivation of the potato, and as the cost of 

 treatment is so small, we would urge every one to make a careful 

 test of this remedy. 



Corrosive sublimate is one of the most deadly poisons^ and should 

 be used with the greatest caution, and never be left where children 

 or irresponsible persons would be likely to get hold of it. This will 

 also apply to Paris green, London purple, or an\' other arsenical 

 poison. In the use of fungicides and insecticides it must be borne 

 in mind that if the season is favorable we may escape injury from 

 insect and fungous pests, but if we fail to make the application of 

 remedies at the proper time and the conditions are unfavorable, fungi 

 may become so firmly established or insects may iucrease so rapidly 

 that it will be impossible for us to dislodge them before they have 

 done serious injury. The only safe course therefore is to make the 

 first applications at the proper time and renew them when rains or 

 other conditions render it necessary. 



REPORT ON POPLAR RUST. 



{Melampsora x)02mlina. Jacq.) 



For several years the row of black or Itftlian poplars {Popidus 

 nigra) which extends from the Botanic museum to the main college 

 buildings, and which have made an almost phenomenal growth, have 

 been seriously injured by this fungous growth. 



It first appears during the hot, moist weather of July and August, 

 and when abundant and appearing at the earlier date kills many of 

 the branches. Its work is largely confined to the lower branches 

 where dew and moisture are more abundant and where the spores 

 are more likelv to reach the leaves. 



