INSECTS OF POPLAK AND POTATO. 183 



LITERATURE. 



SoEAUER, P. Haadbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3. 

 NOssLiN, O. Leitfaden der Forstinsektenkunde, 2d ed., 1913. 

 Hess, R. Der Forstschutz, 189S, 1900. 

 Stebbing, E. p. Indian Forest Insects. Coleoptera, 1914. 

 Bargagli, p. Rassegna Biologica Rincofori Europei, 1883-1887. 

 LiNDiNGER, L. Die Schildliiuse (Coccidae), 1912. 



POTATO. 



(Solunu'in tuberosum Linngeus. Family Solanacea?.) 



Althougli we grow many potatoes in the United States there has been a very large 

 importation trade with other countries. Owing to the danger of introducing certain 

 diseases especially, the Federal Horticultural Board has placed restrictions on the im- 

 portation of potatoes. There are a number of important insect pests which need to 

 be guarded against almost as closely as the diseases. 



A. BETTER KNOWN POTATO INSECTS LIKELY TO BE IMPORTED. 



* Rhizoglyphus (Coepophagus) echinopus F. and R. 



(Potato Root Mite. Tyroglyphidse ; Acarina.) 



Hosts: Potato, parsnip, tulips, lilies, orchids, and many weeds. ' 



Injury: Very destructive to roots and tubers. 



Description and biology: A very tiny mite which breeds in roots and is quite destruc- 

 tive. It may readily be transported with root crops. 



Distribution: France, Italy, Portugal, Palestine, Chile, Australia, California. 

 SoRAUER, P. Handbuch der Pflanzenkrankheiten, 3d ed., 1913, vol. 3, pp. 109-111, 



figs. 82-86. 



Epilachna spp. 



(Potato Ladybird Beetles. Coccinellidse; Coleoptera.) 



Species: E. 28-maculata Motschulsky; China; potatoes, Solanum spp. E. 28- 

 punctata Fabricius; Asia, Malaysia, Australia; Solanacese, Cucurbitacese. E. dode- 

 castigma Mulsant; Asia, Malaysia. Australia; Solanacese Cucurbitacete. E. territa 

 Mulsant; Java; Spanish peppers, Solanacese. E. pusillanina Mulsant; Java, Sola- 

 nacese. E. phyto Mulsant; Java; Solanacese. E. guttato-pustulata Fabricius; Aus- 

 tralia; potato. 



Injury: Attack foliage in larval and adult stage. 

 SoRAUER, P. Handbuch der Pflanzenkrankheiten, 2d ed., 1913, vol. 3, p. 477. 

 Rhigopsidlus tucumanus Heller. 

 (Argentine Potato Weevil; Psaliduridae [Byrsopidae]; Coleoptera.) 



Host: Potato. 



Injury: Bores in potato, making it unfit for use. Has been received alive in the 

 United States in South American potatoes. 



Description and biology: Adult weevil, light brown or grayish, with roughened elytra 

 and short broad beak which rests in a deep groove in front of the anterior legs. Length 

 9 mm. Pupa white with rudiments of all appendages folded on the underside. 

 Found in the potato. Larva white legless with chitinized brownish yellow head.- 

 Bores in the tubers. (See plate xxxvi.) 



Distribution: Argentina, Peru, Bolivia, Chile. 

 Pierce, W. Dwight. Journ. Agr. Research, vol. 1, No. 4, pp. 350, 351, pis. 39-40. 



