Apple powdery mildew and its control in the Pajaro Valley /

Effect of certain hydrocarbon oils on respiration of foliage and dormant twigs of the apple / by Victor W. Kelley.

“…Also, deOng (1927) observed that oil applied in the fall before complete dormancy, or in the spring after the buds were opening, retarded bloom; but that applications in December and January induced earlier blooming. It is possible that the earlier growth attributed to oil applied at certain periods by Felt and deOng as well as by Ballard and Volck (1914) may have been induced by an effect of the oil in breaking the rest period as suggested by Dutton (1924). In view of this hypothesis the greater oil injury observed by Felt and deOng, following an early-dormant application, may have been winter injury due to the breaking of the rest period by the oil.…”

Effect of certain hydrocarbon oils on the transpiration rate of some deciduous tree fruits / by Victor W. Kelley.

“…Observations in early morning, however, showed that the stomata on both sprayed and unsprayed leaves were closed. DISCUSSION Three questions of major importance naturally arise for solution in a discussion of these data: (1) How do oil sprays bring about a retardation in transpiration? (2) There is also considerable indirect evidence that oils affect the stomatal behavior.…”