THE MONTHLY BULLETIN. 165 



CALENDAR OF INSECT PESTS AND 

 PLANT DISEASES. 



By E. J. VosLER. 



[Under the above heading the author aims to give brief, popular descriptions and 

 methods of controlling insect pests and plant disieases as nearly as possible just prior 

 to or at the time when the suggestions given should be carried into effect by the 

 growers. ] 



CITRUS FRUIT INSECTS. 



The Fuller's Rose Beetle. 



The Fuller's rose beetle is of a grayish brown color, about one-fourth 

 inch in length, and has the head prolonged into a short snout. The 

 beetles feed during the night time on the foliage of the citrus tree, and 

 thus do much damage, particularly to the young leaves. They deposit 

 their eggs on the bark of the trees, and the larv£e, upon emerging from 

 the eggs, feed on the roots. The beetles, being unable to fly, must crawl 

 up the tree trunks, in order to attack the leaves. Wrappers, placed 

 around the trunks have been used by various growers. Quayle, in 

 Bulletin 214 of the California Experiment Station, describes a type of 

 wrapper which is made of cotton batting four inches wide. This cotton 

 band is tied with a string on the lower side; the band is then pulled 

 down over the string, so that it extends out a short distance from the 

 tree trunk. Tree tanglefoot is also used, but is liable to catch much 

 diist, thus rendering it ineffectual. 



The Diabrotica Sorer, 



Another beetle which is very common on many of our deciduous fruit 

 trees, and which also attacks the foliage of the citrus, is the Diabrotica. 

 This beetle has been often mistaken for the common red ladybird, but is 

 easily distinguished by its green color and the twelve black spots on the 

 wing covers. It is very hard to control. Two of the methods advocated 

 are jarring the beetles from the trees into a tarred or oiled screen, 

 during the early morning, at which time they are sluggish, and poison- 

 ing them by spraying the trees with arsenate of lead, 5 pounds to 5() 

 gallons of water. 



DECIDUOUS FRUIT INSECTS. 



The Peach Twig Borer. 



In the February number of The Monthly Bulletin, the life history of 

 this insect was given. Early in the spring the small black-headed larvae 

 emerge from their winter quarters in the crotches of the twigs, and bore 

 in the new shoots. These soon wilt and die. If the peach trees have not 

 been sprayed with lime-sulphur solution, just as the blossoms begin to 

 open, spray wdth arsenate of lead, 4 pounds to 50 gallons of water. 

 This latter treatment is intended to poison the borers at the time they 

 begin working on the twigs. The strength of lime-sulphur recommended 

 is 1 part of the commercial preparation to 10 parts of water, applied 

 under a pressure of about 200 pounds. 



