292 MAINE AGRICULTURAL, EXPERIMENT STATION. 1907. 



August 9. Considerable blight on Plot 6, just beyond the 

 center of the rows. Some less on Plots 7 and 8 in about the 

 same locality. Remainder of the plots healthy. This had all 

 developed since the last observation on August 2. 



August 16. Plots sprayed with wet bordeaux free from 

 blight, except a little on Plot 5, adjoining the bad outbreak on 

 the unsprayed check, Plot 6. Plot 2 showed some late blight 

 near the south end, Plot 4 an occasional blighted leaf, Plot 6 

 blight generally distributed over entire plot except on north 

 end. Several rods in center badly damaged. Plots 7 and 8 

 diseased almost as much as 6. Plot 10 some blight on south 

 end. Plot 12, a few blighted leaves. 



August 27. Following the last record several days of bright 

 clear weather held the progress of the disease largely in check. 

 The wet bordeaux plots were clean except as noted on August 

 16 and here there was no increase. All other plots showed some 

 increase of blighted leaves. Following this came another period 

 of rainy weather so that two weeks later the disease had devel- 

 oped to such an extent that the plots could be distinguished as 

 alternate green and brown strips as far as the field could be 

 seen. 



September n. Plot 1, free from late blight, a little early 

 blight. Plot 2, 50 per cent of leaves dead. Plot 3, free from 

 blight except for an occasional leaf. Plot 4, a little healthier 

 than Plot 2. Plot 5, the slight outbreak .noted in one portion of 

 this plot appears to have been entirely checked at the fifth spray- 

 ing on August 16. Plot 6, foliage all dead. Plot 7, 50 per cent 

 of leaves killed. Plot 8, 75 per cent of foliage killed. Plot 9 

 shows an occasional blighted leaf. Plot 10, 75 per cent of leaves 

 killed. Plot 11, about like Plot 9. Plot 12, 10 to 15 per cent of 

 leaves killed by blight. Plot 13, very little blight, better than 

 Plots 9 and 11. 



September 25. Wet sprayed plots showed 80 per cent to 90 

 per cent of foliage still green on this date. On all others the 

 plants were practically dead except on Plots 7 and 12, where the 

 stalks were alive but the foliage dead. 



October 5. Plants on Plots 7 and 12 entirely dead, while 

 those sprayed with standard bordeaux were fully as healthy as 

 at last record. The living plants were all killed by frost during 

 the following week. 



