. Annual report of the North Carolina Agricultural Experiment Station. y in yield between these two fields is tobe attributed to these nematodes. The disease is apparently verywidely distributed through the State, often doing much damage. CARNATION. Root Knot (Heterodera radicicola (Greef), Mul.).—Roots af-fected with nematode galls were sent to the Station for determina-tion from Wake county. CAULIFLOWER. Black Rot (Pseu-d o m o na s campestris(Pam), Smith).—Spec-imens o f cauliflowerthickly covered withdensely black spots wereobserved upon the openmarket in Raleigh. Thedisease was exceedingl
. Annual report of the North Carolina Agricultural Experiment Station. y in yield between these two fields is tobe attributed to these nematodes. The disease is apparently verywidely distributed through the State, often doing much damage. CARNATION. Root Knot (Heterodera radicicola (Greef), Mul.).—Roots af-fected with nematode galls were sent to the Station for determina-tion from Wake county. CAULIFLOWER. Black Rot (Pseu-d o m o na s campestris(Pam), Smith).—Spec-imens o f cauliflowerthickly covered withdensely black spots wereobserved upon the openmarket in Raleigh. Thedisease was exceedinglyconspicuous, owing tothe intense black spotsupon the white back-ground furnished by thehealthy portions of thecauliflower. Upon ex-amination it was foundthat the black spots weredue to bacteria, whichhad all the appearanceof being the usual formcausing the black rot ofthe cabbage. The vas-cular bundles, leading trom the SpOtS toward ^ 8.—Cauliflower Black Rot (Pseudomonas campestris).the Center of the head The blackened spots are caused by this bacterial NOTES ON PLANT DISEASES. 71 were blackened in a manner characteristic of vascular bundles ofplants affected with black rot, and it seems clear that this disease isidentical with the cabbage black rot. From the appearance of the disease it seems certain that the infec-tion was from the surface and the disease was progressing inquiry, it was found that the diseased cauliflower was shippedfrom Washington, 1ST. C, and it was impossible to ascertain Avherethey were grown. The occurrence of this disease in this fashion isof much interest to North Carolinians, since it shows one manner inwhich it may gain access into and distribution through the State. CELERY. Leaf Spot (Sepkoria petroselina Desm. var. apii Br. & Cav.).—This disease made its appearance in a very destructive form in gar-dens in Wake county this year, causing the loss of the whole crop inmany instances. The leaves turn yellow, and then, upon c
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