1890-91.] PEACH YELLOWS. 213 



more or less curled or in-rolled, over the whole of the tree, and the tree 

 at once presents a striking appearance when compared to the deep green 

 of a healthy one. The curling of the leaves is generally due to insects, 

 and often there are brown or red spots on the foliage, which are caused 

 by the fungus Cersospera, which finds a more favorable nidus for growth 

 on diseased leaves. 



The diseased trees seldom live longer than four years, and at that 

 period of the affection they have scant foliage, are very brittle and 

 stiff, and altogether present a strikingly unhealthy appearance. They 

 rarely produce fruit in the late stages, and have many dead limbs. 



Syviptoins in man from eating the fruit. — We will now pass on to the 

 symptoms frequently produced in man and will then take up the 

 diagnosis. 



Violent diarrhoea, slight fever, much abdominal pain and discomfort of 

 three or four days' duration form the symptoms which mark the eating of 

 the fruit. One physician informed us of a whole family having been so 

 affected through eating diseased peaches, and he attributed many other 

 attacks of a similar nature to a like source, although the evidence was 

 not so direct. 



Diagnosis. — The disease must be discriminated from several other 

 conditions which produce somewhat similar changes in the appearance of 

 the trees, but the fruit is diagnostic, in that the changes only appear in 

 this one affection. 



The borer. — The larvae of the " Aegina Exitiosa." A careful examina- 

 tion of the tree will reveal the cause of the unhealthy appearance. Then 

 in this as above stated the fruit is not affected, and again the leaves are 

 said to fall off in August when the tree is vigorously shaken, which is not 

 so with those affected with yellows. 



Root ApJiis. — This attacks the roots of the peach tree, and conse- 

 quently the nourishment is much impaired. It is mostly found in trees 

 planted in sandy ground. The trees are generally stunted in their 

 third or fourth year. Again the same remark applies to the peculiar 

 alteration of the fruit, which will never be seen when the tree is des- 

 troyed by the Aphis. 



Peach Ne7fiatode — Does not occur in this country, and hence can be 

 passed over. 



Starvation. — Trees planted in pure sand and peat produce a feeble 

 growth. Cultivation will alter this condition and also its method of 

 attacking groups and not isolated trees will help in the diagnosis. 



