42 



THE MONTHLY BULLETIN. 



of trees in au orchard were sprayed Avitli Bordeaux mixture twice, once 

 in January and again in April: The remainder of the orchard was 

 not sprayed. In October this entire orchard was fumigated for black 

 scale. On all the trees which had been sprayed with Bordeaux, at least 

 half of the leaves were dropped, while only a few leaves were injured on 

 the trees that had not l)een sprayed. If the fumigation is a year or more 

 after the spra^'ing, or heavy rains have occurred between the spraying 

 and fumigation, very little injury results. 



Many growers, having heard of this injury to trees by fumigation 

 following the spraying with Bordeaux mixture, have raisecl the question 

 as to whether the Bordeaux paste put only on the trunks and not on 

 the leaves in the treatment for gummosis will cause any injury when 

 fumigation is done soon afterward. In answer to this question it may 

 be said that hundreds of lemon trees that had previously been treated 

 with Bordeaux paste on the trunks for gummosis last fall, were af ter- 



FiG. 6. — Both rows of orange trees were fumigated the same night. A hart been 

 sprayed with Borrteaux ; B had' not been sprayed. (Original.) 



wards fumigated, some of them only a short time after the Bordeaux 

 had been applied, and no apparent injury has resulted either to the 

 bark or to the foliage in any case so far observed. This past few 

 months, the writer was shown two recently' fumigated orange groves in 

 which the limbs high up in some of the trees had been painted with 

 Bordeaux for scaly bark. These orchards were fumigated on different 

 nights by the same fumigators. In one orchard the leaves in the tops 

 near the Bordeauxed limbs had been burned more than leaves in the 

 surrounding trees not Bordeauxed, but in the other orchard, very little 

 difference could be detected between the Bordeauxed and non-Bor- 

 deauxed trees. It was said that the weather conditions at the time the 

 first orchard was fumigated were somewhat unfavorable. It would 

 seem, therefore, that where the proper precautions as to weather and 

 moisture conditions are observed by the fumigator, there is no injury to 



