-9- 



30 YOU KOv THESE FACTS ABOUT SCAB? 



One gquAre inch of leaf that hfls wintered over urder the tree may have as 

 many as 2^0 perithecia (winter apcre cfises). 



The perithecia, when ripe_, vdll begin discharging spores five minutes after 

 they are thoroughly wet# 



The spores are shot X/h to 1/2 inch into the air where they are carried by 

 air currents to the buds, leaves, flowers and fruits of the apple trees. 



In 1^5 minutes, 33*313 spores may be discharged froa rne square inch of leaf. 

 Count -them yourself sometime. 



If the ground- in an orchard is covered wLth leaves containing abundant peri- 

 thecia and the trees are planted kO x iiO, it has been calculated that in kS minutes 

 8,107,200,000 spcre^ per tree may be discharged into the air. 



Actual count during a 5-bour period show th§t ascospore distribution varies 

 from 71 to 289 ascespores per cubic foot of air in the orchard, 



A single peritheciuxn discharges spores for one day only; but it may produce 

 more spcred later. 



A leaf continuously wet discharges all its spores in 10 days. If it is dried 

 11 days and re-wet, no more spores are "shot". 



This is importantl Ascospcres and conidia (summer spores) placed on apple 

 leaves arxl exposed to fvill sunlight for 6 days germinated well when moisture was 

 again supplied. 



After ascospcres land on leaves, dew is enough to cause infection - no rain 

 is reeded* 



-CJ.Gilgut 



VARIETIES OF BLUEBERRIES FOR MASSACHUSETTS 



Variety 



Recommended For 



Harvesting Season 



c 



T 



C & H 



C & H 



T 



T 



T 



C & H 



T 



C & H 



H 



C & H 



T 



Early 

 n 



Midseason 

 ti 

 n 



M 



a 



Late 

 It 



II 



II 



II 



It 



