370 JOURNAL OF ECONOMIC ENTOMOLOGY [Vo\. 14 



On September 14, 1917 a heavily infested live oak, fourteen inches 

 ni diam.eter and with a main trunk height below the branches of about 

 ten feet, was foiind in the grounds of the Forest Insect Laboratory at 

 Los Gatos. Larvae, apparently from eggs laid in 1916, from three 

 fourths to one inch long were foimd in mines in the bark and on the out- 

 er surface of the wood. Larger larvae, apparently from several older 

 generations, from two and a half to three inches long were foimd in 

 mines which ran deep into the wood. Reddish borings were common 

 on the bark and on the ground at the base of the trunk. The infesta- 

 tion extended from the groimd into the bases of the larger branches. 



The tree offered such a good chance for life history work that a cage 

 was built aroimd the main trunk. This consisted of a light redwood 

 framework, three feet by three feet square and ten feet high, sixteen 

 mesh galvanized wire screen walls with a door in one side and a can- 

 vas top closel}^ fitted about the trunk and the bases of the larger 

 branches. 



That such a cage is well worth its cost is proven by the interesting 

 results obtained. In 1918 seven moths emerged and were captured. 

 Six were males and one a female. In 1919 nine emerged, five males 

 and four females and in 1920 thirty- four em.erged, fifteen males and 

 nineteen fem.ales. Thi? makes a total of fifty moths reared in the 

 cage during the three years. Twenty-five of these are males and twen- 

 ty-four females. Besides the moths reared in the cage nine males were 

 attracted to the cage from outside trees. Five of these came in 1919 

 and four in 1920. 



In 1918 the first emergence occured on May 21st, in both 1919 and 

 1920 it occured May 19th. The last emergence of the year occurred 

 June 12 in 1918, Tune 24 in 1919 and June 21, 1920. Nineteen of the 

 males were foimd in the cage during the forenoon hotirs and seven dur- 

 ing the afternoon while fourteen of the females were found in the fore- 

 noon and ten in the afternoon. All of the m.ales attracted from the 

 outside came in the afternoon. 



It should be noted here that all of the m.oths that emerged in the 

 cage were taken out as soon as noticed so that there would be no chance 

 of reinfe.'^tation from them. The records therefore indicate that the 

 life cycle is at least three years. Borings are still com.ing out of the 

 wood so the probabilities are that it is longer. 



Methods of control for the ;:arpenter worm in the West have been 

 recommended by several writers. Doten (Nev. Agric. Exp. Sta. Bui. 

 49, pp. 11,12) recommends cutting down and destroying all wormy 

 willows, poplars, cottonwoods and badly infested elms to save the bet- 



