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to be infested is about 2,500 feet above sea-level. It is also noticeable 

 that some varieties of apple have almost entire immunity from the 

 disease, the Bellflower and White Winter Pearmain being among the 

 first, while the Ben Davis suffers very badly. 



Of all the insect pests found in the State, there are but few that have 

 not been found in this county, though some have not become widely dis- 

 seminated. The red orange scale (A. aurantii) has never gained much 

 footing and we believe is now extinct. The Glover scale (M. Gloverii) 

 has been found at different times and places, but has been attacked so 

 vigorously that we believe this, too, is extinct; so also with the black 

 peach aphis (Persica niger), which was found in two places in the bay 

 region. The destructive mealy bug (D. destructor) at one time became 

 so numerous and destructive as to require very radical measures for its 

 suppression, which we believe were in a high degree successful. The 

 purple scale (M. citricola) had become widely disseminated over the 

 county before the present commission was appointed, and notwith- 

 standing the vigorous war waged against it since our appointment, it is 

 still to be found in several places in the county. Commissioner 

 Gunnis, of this Board, has found the Rhizobius ventralis feeding on this 

 pest, also the A. rapax quite often in orchards adjacent to the city. 

 This is also reported by deputy Adams. The three successive years of 

 low summer temperature have proved very favorable to the develop- 

 ment of the black scale (L. oleee), which with the San Jose (A. per- 

 nicious) are probably our worst pests. The first we have hopes of sub- 

 duing by the introduction of the Rhizobius, though no very flattering 

 results have yet been noted from its introduction last year. But both 

 the black and San Jose scales are being successfully combatted with 

 the gas process. We are using C. P. cyanide (98° test) with better re- 

 sults than the 58°, and are able to use it at any time when there is no 

 wind, without injury to the tree. The San Jose scale appears to be 

 vigorous and aggressive in many sections of the county, but in others 

 is giving way under attacks by some parasitic disease or insect. In 

 fumigating apples infected with this pest, we seem to have demonstrated 

 that the larvae of the codlin moth may also be destroyed by this process 

 while in the apple. The cottony cushion scale is still here, and so too 

 is the Vedalia cardinalis, which now appears to be so entirely at home 

 and so well disseminated as to need no fostering care as formerly. 



In District No. 1 the lemon is far in advance of all other fruits in 

 point of acreage, with large plantings for the present year. During the 

 year eighty-four carloads of this fruit have been shipped. Experiments 

 have also been made by this Commission in the manufacture of citric 

 acid and lemon oil. These experiments were successful in a high degree, 

 showing that even the culls may thus be made a source of revenue and 

 profit to the grower. 



In District No. 2 the grape, olive, and orange lead in the lowlands, 

 with the apple largely predominating in the mountain regions. 



District No. 3 is much diversified, the lemon and olive probably tak- 

 ing first place, with the apple first in the mountain section. 



