358 ANNUAL REPORTS OP DEPARTMENT OF AGRICULTURE. 



RESULTS OF STATE AND FEDERAL INSPECTION OF IMPORTED PLANTS AND PLANT 



PRODUCTS. 



As the result of State and Federal inspection the following pests 

 were intercepted during the year: Egg masses of the gipsy moth 

 were taken on six different occasions on stock received from Belgium, 

 Holland, and Japan. Nests of the brown-tail moth were detected 

 on three consignments of nursery stock, one from Ireland and two 

 from France. Puparia of the European tussock moth (NotolopJius 

 antigua) have been frequently collected on stock from France and 

 Holland. The European pine-shoot moth (Evetria buoliana), which 

 is a serious enemy to pine forests in Europe, has been detected on 

 pine seedlings from Holland on no less than 23 different shipments. 

 A closely related species, E. resineUa, has also been taken on pine 

 seedlings from Holland. Citrus stock from Brazil was found infested 

 with one of the white flies, Aleurothrixus floccosa, which is not as 

 yet established in the States. The same material was also infested 

 with an undescribed chaff scale (Parlatoria sp.). Citrus cuttings 

 from the Philippine Islands exhibited a thick infestation of the black 

 chaff scale (Parlatoria zizyphus) . Aji undescribed Aonidia was found 

 thickly infesting the upper surface of the foliage of ''cambuca" 

 {Myrciaria vlicato-coatata) from Brazil. Yams from the Philippine 

 Islands exhioited a severe infestation with the tuber scale (Targionia 

 hartii). Larvae of what appeared to be one of the potato weevils, 

 Rhigopsidius tucumanus, referred to in last year's report, were again 

 found in potatoes from Peru. 



Pear seedlings from France have been found thickly infested 

 with the European pear scale (Epidiaspis piricola). 



Avocado seed from Guatemala, imported under special permit, 

 were found to be riddled with galleries made by the larvae of a species 

 of weevil (Conotrachelus sp.). 



In addition to the above, many insects of greater or less importance 

 have been taken on plants of various descriptions. In all, some 165 

 species of insects have been reported on imported stock during the 

 past year. 



A single infection of the common scab (Oospora scabies) was dis- 

 covered on potatoes from Canada. Potatoes from Canada were also 

 found to be affected with Rhizodonia and silvery scurf (Spondylo- 

 cladium atrovirens). Powdery scab (Spongospora subterranea) was 

 detected by inspectors of the State of Washington on potatoes from 

 British Columbia. 



Citrus canker was discovered on four shipments of citrus bud wood 

 and on a collection of citrus herbarium material from the Philippine 

 Islands. These interceptions were particularly fortunate in view of 

 the fact that a part of the shipments were destined to go to citrus 

 regions of California. Four shipments of citrus were found infected 

 with wither tip (Colletotrichum glceosporioides), three of which were 

 received from the Philippine Islands and one from Japan. Melanose 

 (Phomopsis citri) was detected by the California authorities on citrus 

 from Japan. Kudzu from Japan was found to be affected with a rust 

 known scientifically as Woroninella puerari^. 



In addition to the above, it was possible to identify the causal 

 organism of some 85 specific diseases entering on imported stock. 



