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Experiments and investigations concerning chemical preparations for the control of plant diseases and weeds


, : Experiments and investigations concerning chemical preparations for the control of plant diseases and weeds. Beretn. Planteavl., Sjaelland 1938. 208-219

Stripe disease of barley, which occurred in 40 per cent. of the fields inspected, was effectively combated in eight years' experiments (1930 to 1937, inclusive) in various localities of Zealand, Denmark, by all the six disinfectants tested, viz., dahmit, sanagran, dansk tillantin, abavit-neu, and tillan-tin 1875, the average incidence of infection in the treated lots being 0.2 per cent. for the first-named and 0.1 per cent. for the five others compared with 6.2 per cent. for the untreated controls. The average annual increases over the 7-year period in the yields of barley and oats treated against stripe disease and loose smut, respectively, by these preparations are estimated at 231 and 167 kg. per hect., respectively. Loose smut was entirely eliminated from Kenya barley in three years' experiments by immersion in hot water at 51 degrees C., with or without the addition of 1.5 per cent. dahmit or 0.75 per cent. tillantin, but the treatments caused average reduction of grain yield of 51 and 32 kg. per hect., respectively. The disease was present in 86 out of 87 fields examined, in only four of which, however, did the incidence of infection exceed 1 per cent.

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