280 THE MONTHLY BULLETIN. 



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 diseases as nearly as possible just prior 

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

 growers. ) 



DECIDUOUS FRUIT INSECTS. 



The Codling Moth. 



The third application of the arsenate of lead spray for the codling 

 moth larvie, which eat into the fruit of the apple and pear, should be 

 made from five to six weeks after the blossoms have fallen. This spray 

 is necessary in order to coat the fruit with arsenic, so that when the 

 majority of the first generation of larvfe emerge from the eggs they 

 will eat the poison on endeavoring to enter the fruit and be destroyed. 

 Make the application thorough, so that every leaf and all sides of every 

 apple will be covered with the arsenate, as the codling moth worms may 

 enter the fruit from any side. Maintain at least 200 pounds pressure 

 and use 5 pounds of the arsenate to 100 gallons of water. These three 

 applications are usually sufficient to control this pest. 



Red Spider on Deciduous Trees. 



Two important pests of the deciduous fruit trees are the brown mite 

 and the two-spotted mite. The mites puncture the surfaces of the leaves, 

 sucking out the sap and producing a pale spotted effect. Later the 

 leaves fall and as a consequence the fruit is often seriously affected, 

 being stunted and thus rendered difficult to sell. Most of the injury 

 during the early part of the growing season is due to the brown mite, 

 while later injury is due to the two-spotted spider. 



The eggs of the red spiders are laid mostly on the under surfaces of 

 the leaves, and appear as minute, reddish or light colored globules. 

 Applying flowers of sulphur on the trees by means of a blower will 

 control the red spider, particularly during the earlier stagas of infesta- 

 tion. The sulphur is applied during the early morning, so that the dew 

 will catch the particles of sulphur and, therefore, cause better adherence. 

 The sulphuring should be repeated, especially after showers. The wet 

 sulphuring sprays, such as atomic ancl milled sulphur, are efficient in 

 controlling the red spiders, ancl many growers claim that these finely 

 divided forms of sulphur produce better results than the dry sulphur 

 treatment. The atomic sulphur is used at the rate of 10 pounds to 

 100 gallons of water. Spray during clear weather when the tre&s are 

 dry and cover all the leaf surfaces. 



CITRUS FRUIT INSECTS. 



The Citrus Red Spider. 



The citrus red spider is a tiny reddish mite, Avhich infests the citrus 

 tree and is often numerous enough to greatly reduce the orange crop. 

 The red spiders are generally found on the under sides of the leavas, 

 and are particularly numerous in the interior portions of the trees. 



