192 Proceedings of Indiana Academy of Science. 



noted in one planting near Mooresville, but was not nearly as severe as on 

 raspberries. 



Yellows caused by Fusariwm conglutinans remains the limiting factor in 

 this crop but was not as severe this year as in 1919 owing to the cooler tem- 

 peratures. It was prevalent in small gardens as well as fields and the cab- 

 bage soils of the state are pretty generally infested. In Lake county the 

 resistant Wisconsin Hollander is coming into rather general use as a late 

 crop. A trial of the yellows-resistant Copenhagen developed at the Iowa 

 station was made in Lake and Marion counties but the growers were not 

 satisfied with the type. 



Black rot caused by Pscudomonas campestris was noticed this year and 

 black-leg due to Plwnui liiigam was found in Lake county and in several 

 market gardens near Indianapolis. Clubroot occurred in a few fields in 

 Lake county. Hail injury intumescences were noted in one field near 

 Indianapolis. 



CANTALOUPE. 



Bacterial wilt caused by Bacillus tracheipMlus was the most important 

 disease of this crop and its attacks continued until much later in the season 

 than usual. Early in July, 2 to 10 per cent infection was found in fields 

 near Decker and Princeton and the disease was later noted near Indian- 

 apolis and Lafayette. Where the hill system of culture is used, wilt often 

 causes large blanks in the fields and in a bad wilt season like 1920 the row 

 system is preferable. 



Leaf blight caused by Altemaria Irassicae nigrcscens was generally prev- 

 alent and particularly destructive this year. In the Decker region it was 

 just beginning to show up July 1 and by the end of the season was the 

 most prevalent disease. Not only was it severe on the old cantaloupe fields, 

 but it also occurred in new soil not previously in cantaloupes. In the 

 latter case, however, the epidemic came too late to do serious damage. 



Mosaic was found in several fields early in July and was rather serious 

 even at that early date in one field near Princeton. Some plants showed 

 such extreme effects of the disease that it seemed likely that the trouble 

 was contracted before they were transplanted from the plant bed. Late 

 in the season mosaic was very general in the Decker region but the attack 

 seemed to have been of rather late inception and probably was correlated 

 with the heavy aphis infestation. No anthracnose was found. 



CAKNATION. 



Rust (Uromyccs caryopMlmus) was generally present in greenhouses. 



Nematode root-knot occurred in the infested area of muck soil near 

 Goshen. 



