90 Farmers’ Bulletin 1261. 
ened, and frequently there is a considerable shedding of the bloom 
due to this work. The principal injury caused by the thrips, how- 
ever, is due to its feeding on the stamens and the flower parts. The 
thrips does not attack the fruit. 
HOW IT MAY BE CONTROLLED. 
The avocado blossom thrips may be controlled by spraying with 
40 per cent nicotine sulphate solution at the rate of 1 part to 900 
parts of water with the addition of 3 or 4 pounds of soap to each 
100 gallons of the diluted spray. The grower should not wait until 
I'ic. 15.—The avocado leaf roller: Avocado leaves showing rolling of foliage by the 
larve and cocoons in folds of leaf. 
the trees are in full bloom but should start spraying as soon as a 
number of thrips are observed about the blossom cluster. The spray- 
ing should be repeated in from 8 to 10 days, if the thrips are abun- 
dant about the bloom. The spraying should be directed so as to enter 
the blossoms. 
THE AVOCADO LEAF-ROLLER. 
An insect present on the avocado in June and July is the avocado 
leaf-roller.”. It is a very small moth, grayish is color, about one- 
fourth inch long. It deposits its eggs singly on the new growth, 
often each young leaf in a terminal cluster bearing a single egg. The 
young larvee which emerge from these eggs feed on the lower sur- 
7 Gracilaria perseae Busck, 
