138 PROCEEDINGS OF THIRTY-THIRD FRUIT-GROWERS ' CONVENTION. 



offspring anchored on the leaves. Men were then started to work 

 stripping the defoliated trees of their new leaves and destroying the 

 same. Constant inspection was carried on, each block was platted sep- 

 arately, and weekly summaries made of the same. 



An inspection was recently made showing much completer work than 

 the original plan had promised, our original idea being, primarily, to 

 prevent the immediate spread. The presence of mature white flies has 

 been reported several times, even recently, by persons who have not 

 looked into the matter thoroughly before spreading the report that they 

 were Aleyrodes citri. It must be remembered that in Marysville and 

 the surrounding country, Aleyrodes species are extremely common. 

 These are native, harmless species, which, in the adult stage, closely 

 resemble the Aleyrodes citri, the insect we are trying so hard to eradi- 

 cate. In one case in particular the adult flies were reported on an orange 

 tree. The place was immediately inspected and several specimens of 

 mature flies were found upon the foliage; however, diligent search 

 failed to reveal the eggs, larvae, or pupaB of any Aleyrodes whatever; 

 yet the mature forms were there, and to a person not familiar with the 

 work it was taken for granted that the work had been a failure. Upon 

 looking carefully, taking into consideration the native forms, there was 

 found upon the porch a wisteria vine that was heavily infested with 

 Aleyrodes acacia, and the dense foliage full of mature or adult flies. 

 By shaking the vine they were disturbed and several specimens were 

 carried, by a little breeze, directly on the orange tree. This is one 

 case of many where reported adults have proven to be native species. 



A long practical experience in combating many different forms of 

 destructive insect pests over extensive horticultural areas in Cali- 

 fornia ''warns us" not to be so egotistical as to make the positive 

 statement that the white fly has been eradicated in Marysville, but it 

 is now certainly under control and in such shape that should it show 

 up as is expected in a certain watched spot, it can be handled with 

 comparatively little expense or trouble. During the winter and with 

 the completion of our campaign satisfactory results will undoubtedly be 

 recorded. 



The horticultural laws of California are very stringent. First, they 

 make it the duty of the State Commissioner of Horticulture to deter- 

 mine whether a pest is dangerous or not, and to prescribe the remedy 

 that should be applied in each case. This notice must be sent to each 

 County Horticultural Commission and instructions given them in 

 detail. This notice is made a part of the county notice that has to be 

 served on each party owning or having in his charge infested trees, 

 and is accompanied by an order from the County Commissioners declar- 

 ing the pest a public nuisance and ordering the same abated within the 

 time given and in the manner stated. Thus we see that it is made the 



