MICHIGAN ACADEMY OF SCIENCE. •'^41 



i^howing definite bacterial contamination was seen. It is very evident that 

 this disease is closely allied to bean blight in its manner of attack, etc. 



Various seed lots of peas, when examined in the neighboring gardens, 

 showed widely varying amounts of the disease. It would seem that this pea 

 disease is likely to be of great importance in the industry. 



Raspberry I)lsea.ses : For some years cane blight, anthrncnose, and 

 orange rust and leaf curl have been the common diseases on Michigan plant- 

 ings of raspberries and blackberries. Cane blight and anthracnose continue 

 to be imiMjrtant diseases in causing loss to the crop, the cane blight apparently 

 being the cause of the greater loss. Orange rust was found commonly on wild 

 members of the genus Rubus. It was reported from one cultivated plantation. 



Raspberry curl was reported from Hillsdale. Berry, Marquette anfl 

 Ottawa Counties, doing special damage to Red Raspberries. This disease Is 

 markedly on the increase and is probably the most serious of the red raspberry 

 diseases. 



Sugar Beet Diseases : In a last year's report the occurrence of Phoma 

 leaf spot of sugar beet was recorded. In Jime, 1918, numerous specimens 

 from Midland, Ottawa, Ingham and Shiawassee Counties were sent to the 

 laboratory. These specimens were in the seedling stage and the disease caused 

 a "black root." Plantings gave practically pure cultures of Phoma betae. The 

 disease was evidently seed borne, and the wet weather of early .Tune was 

 undoubtedly a contributing factor to the loss. 



Onions : Attention was called in March, 1918, to the attack by Botrytis 

 nllii iu)on young plants developing from onion sets. Field examination showed 

 the loss from the decaying of the buli)s to be considerable enough to produce 

 failure in certain parts ctf the farm. It seemed that the bulbs were harvested 

 when immature and unsuitable storage conditions brought about the loss. 



No trace of onion smut were discovered, though search was made. Prr- 

 ouapora ><vhleidniu was not [iresent so far as could be learned. Reports Indi- 

 cated damage in other years. 



Potato Diseases: The diseasos of this important crop are handled upon 

 another page of this reitort in the detaih'd studies by Dr. Woodcock. Atten 

 tion may be called to the fact that late blight did not develop in Michigan in 

 1918. In previous publications' attention has been called to the relation of 

 weather to late blight epidemics. Wet weather in the first half of the growing 

 season is the deciding factor influencing the late blight outltreaks. The effect 

 of dntught conditions in the early part of July in checking late blight is evi- 

 dent and affords the weight of another year's corroborative evidence to the 

 conclusion previously drawn. 



Through the inspectors of the U. S. Bureau of Markets, reports on Mich- 

 igan cars for which inspection is requested have been made avallabl? to thic 

 office. These reports are given on the following table: 



