Report of the director . Fig. 2i.—Spraying Celery on Experimental Plots. As a result of several years careful vv^ork it has been shown thatBlack Root Rot of tobacco is caused by Thiclaviopsis hasicola,a fungus distinct from Thielavia hasicola, which was formerlysupposed to be the asco stage. The study of mosaic has now been in progress twenty-two no other plant disease has attracted so wide attention in REPORT OF THE DIRECTOR 199 recent years, many botanists having taken up this perplexingproblem. At this Station we are encouraged by recent discoverieswhich will throw further lig
Report of the director . Fig. 2i.—Spraying Celery on Experimental Plots. As a result of several years careful vv^ork it has been shown thatBlack Root Rot of tobacco is caused by Thiclaviopsis hasicola,a fungus distinct from Thielavia hasicola, which was formerlysupposed to be the asco stage. The study of mosaic has now been in progress twenty-two no other plant disease has attracted so wide attention in REPORT OF THE DIRECTOR 199 recent years, many botanists having taken up this perplexingproblem. At this Station we are encouraged by recent discoverieswhich will throw further lig-ht on the nature of the disease. Abulletin is now in preparation. Apple and Peach Diseases continue to occupy much trials of new dusts and sprays, combinations of both andmethods of application, were continued in the Station orchards atMt. Carmel farm and at the farms of Mr. Piatt at Fig. 34.—Young Pine Plantation in Brush Land. THE INFLUENCE OF SOIL ON THE FOREST This is practically a virgin field upon which the station forestersbegan work two years ago. Very little work has been done inthis country or abroad, partly due to the lack of knowledge of thesoils in forested regions. In Connecticut fully two-thirds of theland area is best suited to forestry, at least under present eco-nomic conditions. If the soil is a factor to be reckoned with inplanting and managing forests and wood lots, then it is essentialthat we know the part it plays. To discover the facts a detailedstudy is now under way in close cooperation with the Soils Depart-ment. On each of our important soil types several timbered plotshave been laid out. Careful measurements are made of thespecies, growth and stand as well as of the factors of soil water,reaction, and nutrients present. Out of this we hope to establishthe effect, if any. of soil on our native and introduced trees andthe adaptation of
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