244 Peach-Growing 



legs, and it is quite possible for the young specimens to leave 

 one spot and go to another. Sometimes, but not often, they 

 do this. For a period of six or eight weeks the insects remain 

 on the leaves and during that time more or less honey dew is 

 produced. Upon this a soot-fungus grows which seriously im- 

 pairs the growth of the foliage and ruins the fruit. The develop- 

 ment is very slow and irregular, and I have found in mid- 

 August eggs, recent larvae, well developed sets and male pupae 

 all on the one tree." 



The most serious injury caused by this insect is due to 

 the deposit on the fruit, leaves, and branches of a sweet, 

 sticky secretion known as "honey dew." A black, sooty- 

 appearing fungus develops in the honey dew, thus making 

 the fruit so unattractive in appearance as to be unsaleable. 

 This applies especially to the later varieties, since the earlier 

 sorts are harvested before the deposits of honey dew be- 

 come extensive. 



Methods of control of terrapin scale. 



A number of predacious insects attack this Lecanium 

 and it also has several parasitic enemies, but these are not 

 suflScient as a rule to hold it in subjection. Remedial 

 measures have often proved unsatisfactory on account of 

 the very complete protection afforded by the naturally 

 secreted protective covering. The lime-sulfur mixtures, so 

 useful in controlling San Jose scale and many other insects, 

 have proved ineffective. Symons ^ found that miscible oils, 

 of which there are several standard brands on the market, 

 applied at the rate of 1 part oil to 15 parts water, just before 

 the buds start in the spring, gave satisfactory results. These 

 results have been confirmed by extended use in commercial 

 1 Md. Exp. Sta. Bull, 149, 



