THE MONTHLY BULLETIN. 



177 



spring and summer. The first to appear oviposit mainly upon the 

 leaves ar.d twigs, very few eggs being laid upon the fruit. The eggs 

 of the second generation are usually placed upon the fruit. The larvae 

 hatching from the first eggs usually begin to work immediately upon 

 the leaves while those of the second generation gain entrance to the 

 fruit almost immediately at the calyx end. It requires about twenty 

 days for the larvae to mature. 

 The generations overlap greatly 

 throughout the summer. Adidts 

 appear about the middle and in 

 a few days begin egg laying. The 

 entire life cycle occupies nearly 

 fifty days, there being two broods 

 each year in the Western States. 



Distribution. — In all parts of 

 the State, excepting the northern 

 coast counties and even these are 

 not entirely exempt. 



Food. — All varieties of the fruit 

 of apples and pears. 



Control. — The accepted treat- 

 ment for this pest is spraying 

 with arsenical sprays. The first 

 application should be made just 

 as soon as the petals of the blossoms 

 fall and the sepals of the calyx are open (Fig. 162). It will be 

 difficult to find a time when all of the calyx cups are the same, but 





Fig. 161. — The codling moth, Ci/dia 

 pomonella (Linn.), a, apple cut to .show 

 the borings of the larva; h, place 

 where the egg was laid and the larva 

 started ; d, pupa ; e, larva ; f and g, adult 

 moths ; ?i, head of larva ; 1, cocoon. 

 (U. S. Dept. Agrcl.) 



Fig. 162. — Young apples at tlie left are just right to spray for the codling 

 moth, the calyx lobes being extended and open, while the apples at the right 

 are too mature, tlie lobes being closed and too late to treat for codling moth. 

 (After Quaintance. ) 



work should be started as soon as possible, and the entire orchard 

 sprayed within a few days. Thorough work with high pressure and 



