Apple rust . they lodgein the axils of the tiny leaf scales, producing an infection inthe young growth of the cedar. No outward indication ofsuch cedar infection can be observed until the followingseason. CONDITIONS INFLUENCING INFECTIONOF APPLE. It was believed that a more definite knowledge of theconditions which bring about rust infection of the apple underfield conditions would be of value, and some attention hasbeen devoted to this matter. These conditions readily fallunder four main heads: 1. Development of rust galls on the cedar. 2. Meteorological conditions. 3. Development of apple fo
Apple rust . they lodgein the axils of the tiny leaf scales, producing an infection inthe young growth of the cedar. No outward indication ofsuch cedar infection can be observed until the followingseason. CONDITIONS INFLUENCING INFECTIONOF APPLE. It was believed that a more definite knowledge of theconditions which bring about rust infection of the apple underfield conditions would be of value, and some attention hasbeen devoted to this matter. These conditions readily fallunder four main heads: 1. Development of rust galls on the cedar. 2. Meteorological conditions. 3. Development of apple foliage. 4. Location of orchard in relation to cedars. The normal rust galls of G. juriiperi virginianae as theyoccur on the red cedar in West Virginia are capable of dis-charging large numbers of sporidia at almost any time fromthe first of April to the first of June. This period varies con-siderably with different seasons, but the fruiting bodies arealways well developed by the time that the apple buds begin. 18 W. Va. Agrl. Experiment Station [Bul. 154] to open, and slight rust infections often occur as late as thefirst week in June. The ability of the rust galls to produce and dischargesporidia is closely associated with meteorological difficulty was experienced in our endeavors toaccurately determine the interrelation of meteorological fac-tors with infection periods. Some general notes were madeas to weather conditions during the season of 1912. Theserecords were as good as could reasonably be secured underthe circumstances. Data covering the critical period for thatseason shows that there was fair weather from the first to thefifth of May, a light shower on the afternoon of May 5th, fairlyheavy rains from the afternoon of May 6th to the afternoon ofMay 8th, and fair weather from the 9th to the 11th. The im-portant rust infection for 1912 took place between the even-ing of the 6th and the afternoon of the 8th of May. Therewas a slight earlier infecti
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Keywords: ., bookcentury1900, bookdecade1910, bookidapplerust154, bookyear1915
