-6- 



A program of oil, once every three years, would seem logical and adequate in 

 orchards where San Jose Scale is not noticeable now. This action, if thoroughly 

 carried out, might well serve to hold in check an incipient outbreak. 



E. H. Wheeler 



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CONTROL OF FUSICOCCUM PEACH CAI^IICER 



Two major infection periods are recognized in the lite cycle of the pathogen: 

 (1) Autumn season infections of buds of current season's growth; (2) Spring season 

 infections of leaf cluster buds, basal portion of axillary shoots and leaf blades. 

 Autumn season infections occur in rain periods from September to the onset of cold 

 weather, and the earliest cankers appear in October and they continue to appear, 

 with the advance of the fungus from infected buds into the bark about the nodes, 

 throughout the winter, early spring and through the blooming period. These cankers 

 provide most of the conidiospores for the spring season infection phase which 

 occurs after the dormant season and in rain periods . Disease from these infections 

 appear in May and June, such as dead leaf clusters and axillary shoots, basal 

 shoot cankers and leaf spots. 



A tight protectant spray schedule covering the two infection periods has given 

 good control of the disease. The protectant schedule is started in September after 

 Golden Jubilee harvest, and is continued at 10-12 day intervals or in advance of 

 rain periods using a mixture of 1/4 lb. of Dichlone, 1 1/2 lbs. of Ferbam, and 3/4 

 pint of Glyodin to 100 gallons of water. Glyodin is added as a spreader. Good 

 coverage of buds is important. Captan and Thiram are also effective. Final appli- 

 cation is made when 90 per cent of the leaves have fallen. For this last applica- 

 tion use liquid lime sulfur (7 gals.) and 3/4 pint of Glyodin to 100 gals, water. 



The lime sulfur-Glyodin is repeated at late dormant in the following spring 

 season. It is followed by applications of Dichlone- Ferbam at full pink, 

 calyx and shuck fall, coinciding with the schedule for the control of early 

 brown rot. 



In addition to thorough protectant spraying, pruning in June in addition to 

 dormant pruning is most desirable as a sanitary control measure. The orchard 

 should be sown to a thick stand of cover crop in early July to soften the effect 

 of heavy late season rains on growth. 



The Fusicoccum pathogen is a wound parasite. Over 90 per cent of the cankers 

 on water sprouts and terminals are distributed among the nodes in the distal half 

 of the latest growth. Of this percent, between 60 and 70 percent of the cankers 

 are distributed in the last quarter or 3/4 - 4/4 of the latest season's growth. 



A good spreader- sticker In the fungicide schedule is Important. The buds 

 must be well protected periodically as they swell late in the growing season and 

 as the bud scales are pushed away. 



The program is costly. A badly diseased orchard can be rehibilitated in 3 

 years on the basis of our experience. 



E. F. Cuba 



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