26 

 distrilDution over the tree has led to its receiving different names 

 according to the manner in which it shov/s itself. Accordingly, 

 there is the blossom blight, which causes the blossoias to wither 

 prematurely and often times preventing the fruit from setting; 

 or if the fruit should set, caus ing it to remain small and 

 unsightly; the twig blight which causes the death of many of 

 the fruit spurs and is usually a direct infection by the blossom 

 blight; then there is the blight which manifests itself on the 

 larger limbs and trunlf, properly known as fire blight or just 

 plain "blight". The cankers appear as discolored and somev/hat 

 sunken areas of suooth bark, the margin along the advancing 

 border being raised in a sort of blister. The tissue in actively 

 spreading canker is of a darker than that of healthy bark and 

 is very watery or sappy. On damp clowdy days drops of a milky 

 Sticky fluid exhude from the cankered tissues through the 

 lanticels or pores of the bafk, A large proportion of the 

 cankers are active during only one season but there are always 

 some which are perrenial and live over to the next season. The 

 diseased bark is usually killed to the wood to which is sticks 

 tenaceously the first season. It gradually decays, however, 

 and falls out, leaving the wood bare and exposed. The bacillus 

 can gain entrance into the bark in any of the following v>rays: 



1st, Through infected water sprouts or suckers. 



2nd, Through infected pruning instruments. 



3rd, Through wounds made in the bark by careless ■.vorluuen 

 in cultivating, 



4th, Through the agency of insects which puncture the leaves 

 and small fruits. 



The dissemination of the disease is furthered by damp 



