. Better fruit. Fruit-culture. Pa^e 8 BETTER FRUIT April •'2 8 Teet- 14 Feet Normal Fob- iTioN or 5)"PR AY Rod FicuRE 5. This shows relative position of the nozzles to the height of a large tree \\hile spraying in a normal position *2 8 Teet- Limit ot 2 2 Teet- Ett EOTIVt WORK- i-i^' 17 Te^T- E ND E P TO THE Limit. 5 T" E E T. Figure 6. This shows the relative position of the nozzles to the height of a large tree when the rod is held at arm's length. Note that there is nmch tree surface above this point Is the Fifth Scab Spray Necessary? The secret of growing scab-free fruit lies in
. Better fruit. Fruit-culture. Pa^e 8 BETTER FRUIT April •'2 8 Teet- 14 Feet Normal Fob- iTioN or 5)"PR AY Rod FicuRE 5. This shows relative position of the nozzles to the height of a large tree \\hile spraying in a normal position *2 8 Teet- Limit ot 2 2 Teet- Ett EOTIVt WORK- i-i^' 17 Te^T- E ND E P TO THE Limit. 5 T" E E T. Figure 6. This shows the relative position of the nozzles to the height of a large tree when the rod is held at arm's length. Note that there is nmch tree surface above this point Is the Fifth Scab Spray Necessary? The secret of growing scab-free fruit lies in the absolute prevention of leaf infection. If this is accomplished, the apples will incidentally be kept clean. With a portion of the trees left open to infection, even though it be only a few leaves in the top, chances of serious fruit infection, taking place early in the summer, are greatly increased, especially if the 30-day lime-sulphur sjjray is omitted. The sixteen days of rain which occurred during late June and early July, produced at least 75 per cent of the scab which occurred at Hood River during 1916. Infection could not have taken place if fruit and foliage had been kept clean up to this time. As shown in Block 4, though the results from the standpoint of scab con- trol were not as complete as obtained in Block 3 with five applications, the percentage of infection that re- sulted must be considered a very effective reduction. The trees in this experiment were last sprayed on May 24. On June 17, nearly a month later, rain began falling, continuing some every day until July 3. There is no doubt that a good deal of the protec- tion derived from the last application of spray had disappeared through weathering and expansion of both the fruit and leaves before this favorable scab-infection weather was over. In spite of this long-continued rainy spell, infection of but per cent of the fruit resulted. During this time scab increased on the unsprayed check trees
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Keywords: ., bookcollect, bookcollectionbiodiversity, booksubjectfruitculture
