INSECTS OF RHUBAEB AND RICE. XgQ 



RHUBARB. 



{Rheum rhaponticum, etc. Family Polygonacege.) 



Robust perennial herbs originating in Asia and Russia. The rhubarb plant has 

 been developed into several garden varieties. Propagated by root division or from 

 seed. 



IMPORTANT RHUBARB INSECTS. 



COLEOPTERA. 

 Chrysomelidae. 



Chxtocnema concinna Marsh; flea-beetle; Europe. Phyllolreta nemorum Linn^us- Europe fSee 

 Crueifers.) ^ ' ^ 



Ciirculionidae. 



Hypera rumicis Linnaeus; Europe; breeds on leaves. 



RICE. 



{Oryza sativa Linnaeus. Gramineae.) 



Rice is still an important product for importation in spite of the steadily increasin<^ 

 production in our own country. The principal sources of importation are Japan" 

 China, India, Mexico, and Honduras. The danger of importing rice insects is two- 

 fold, through the grain itself, husked or unhusked, and its original containers and 

 through nee stalks used in packing fragile articles of commerce. The similarity of rice 

 and grain insects lends importance to any rice pest introduced into the United States. 



A. RICE INSECTS LIKELY TO BE IMPORTED. 



Schoenobius blpunctUer Walker. 



„ .^. (Rice Stem Borer. Lepidoptera.) 



Host: Rice. 



Injury: Bores in stalks, causing infertility. 



Description and biology: Adult moth, straw-yellow color, the forewings having one 

 black dot on each. Body about one-half inch in length, wing expanse about 1 inch 

 Pupa m silken case in straw. Larva bores in the stalk and remains in the stubble from 

 November to June. Eggs laid in clusters on the leaves, covered with hairs: hatch in a 

 week. 



Distribution: India. 



S. K. Basu and H. L. Dutt. Crop Pest Handbook for Behar and Orissa, 1913 Dept 

 Agr. Behar and Orissa, Calcutta, leaflet 6, pi. 6. 



Chllo auricllia Dudgeon. 

 (Rice Stem Borer. Pyralidse; Lepidoptera.) 



Host: Rice, sorghum, corn, sugar cane, Pennisetum. 



Injury: Bores in stems of grasses. 



Description and biology: Adult moth with metallic spots on fore wings. Larva 

 whitish with black head, thoracic shield and setigerous spots, and with purplish 

 brown stripes. 



Distribution: India. 



Maxwell-Lefroy, H. F. Mem. Dept. Agric. India. Ent. Ser., vol. 1, pt. 2, p. 197. 

 SoRAUER, P. Handbuch der Pflanzenkrankheiten, 1913, 3d ed., vol.' 3, p. 316. 



B. OTHER IMPORTANT RICE INSECTS. 



The rice plant has many pests which attack the leaves, stalks, and roots, but which 

 are not very likely to be imported. It is, however, of importance to briefly mention 

 these m view of unforeseen possibilities of importation. 



