Ontario Sessional Papers, 1901, . g out the plants made fairly vigorousgrowth in spite of the fact that the leaves were considerably spotted. During the monthof Augusc, however, the celery made but little growth, while the disease had spread tosuch an extent that it wa^ thought the crop was completely ruined ; but the cool nights ofSeptember and early October checked the progress of the disease so much, and the fre-quent showers invigorated the plants to such an extent that a fair crop was obtainedafter all. It would appear from a study of the conditions, that intense heat accompanied
Ontario Sessional Papers, 1901, . g out the plants made fairly vigorousgrowth in spite of the fact that the leaves were considerably spotted. During the monthof Augusc, however, the celery made but little growth, while the disease had spread tosuch an extent that it wa^ thought the crop was completely ruined ; but the cool nights ofSeptember and early October checked the progress of the disease so much, and the fre-quent showers invigorated the plants to such an extent that a fair crop was obtainedafter all. It would appear from a study of the conditions, that intense heat accompanied bydrouth is the main cause of the disease ; for many plantations which were shaded and onlow ground escaped the disease entirely. The rainfall in inches during the months inwhich celery makes most of its growth was as follows : July, ; August, .87 ; Sep-tember, ; October, In August, the vitality of the celery was sadly impaired on account of the intenseheat and severe drouth ; accordingly the fungus made great Celery Blight. {Cercospora Apii.) , Fig. 3.—A, spores through the agency of which the disease spreads ; B, tuft of aerial threadprotruding through a breathing-pore of a leaf; C, a dissased leaf, showing the brown spots(Original.) The best remedy against the blight is the ammonia copper carbonate solution, preparedaccording to the following formula : Copper carbonate. 6 ounces. Ammonia water 2 pints. Water 45 gallons. The plants should be thoroughly sprayed at intervals of two weeks from the timethey are set out until all danger is over. 1900] AGRICULTURAL COLLEGE. 17 5, Tumble-weed (Amarantua albus, Fig. 4.)—This wetd poiaesots powtrs ofdistribution, and in some localities is doing much harm. Our attention was called to afarm near the College where this tamble-weed had monopolized an entire field of tenacres. Last year only a few specimens of the plant were observed. No attention waspaid to them ; they were not destroyed, and the r
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