. Better fruit. Fruit-culture. Figure 5—A BartlrtI pear twig showiiiR the condition of the Inicis at the time wiuri the second scab spray or the "pink" spray sliould be applied. is dependent upon moisture conditions it is evident that the number of spray- ings must vary with the season. Among the most efhcient fungicides against pear scab are two materials quite universally used, lime-sulphur so- lution and bordeaux mixture. Both may be purchased in convenient form on the market, but often may be more econ- omically prepared at home. The former sometimes causes foliage injury, but at
. Better fruit. Fruit-culture. Figure 5—A BartlrtI pear twig showiiiR the condition of the Inicis at the time wiuri the second scab spray or the "pink" spray sliould be applied. is dependent upon moisture conditions it is evident that the number of spray- ings must vary with the season. Among the most efhcient fungicides against pear scab are two materials quite universally used, lime-sulphur so- lution and bordeaux mixture. Both may be purchased in convenient form on the market, but often may be more econ- omically prepared at home. The former sometimes causes foliage injury, but at a dilution of 1 to 40 it is quite safe to use on pears. Bordeaux mixture is a somewhat stronger fungicide, but it frequently causes an objectionable rus- seting when applied to tender young fruits and is in less favor on this ac- count. It is, however, very efTicient in controlling pear scab. Sulphur, very finely divided, in the form of an im- palpable powder and applied with a dusting machine (Figine 3), is also an efticient fungicide against pear scab, be- ing much more satisfactory in this re- spect than the commercial bordeaux dusts that are now on the market. These general statements concerning spray materials, as well as those which . follow in regard to their application, are based upon a series of experimental tests carried out by the Office of Fruit Disease Investigations of the Bureau of Plant Industry during the seasons of 1915 to 1918, inclusive, at Vancouver, Clarke County, Washington, and at Salem, Marion County, Oregon. The results agree, however, rather closely with those previously obtained, and with well-established usage, in the humid Northeastern United States, especially in the Great Lakes region, where pear scab is very severe. When to Spray for Pear Scab—Make the first application for pear scab be- fore the cluster buds begin to separate (Figure 4), and about the time that the first white is seen in the flower buds, using a strong bordeaux mixture (4
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