Holdaway, F.G.

Nishida, T.

Proceedings of the Hawaiian Entomological Society

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167Insects Associated With Freshly Threshed Dry BeansBY DR. F. G. HOLDAWAY and MR. T. NISHIDAUniversity of Hawaii.(Presented at the meeting of December 22, 1941)Dr. F. G. Holdaway and Mr. T. Nishida contributed the following information on insects associated with freshly threshed drybeans. The beans were grown at Ewa Plantation in an Emergencypilot planting. They were harvested and threshed at the end ofSeptember 1941.THRASHINGS FROM THE THRESHER SCREEN lj^ I,BS.The threshings contained plant debris and a few broken andsound beans of Blackeye cowpea.Insects recoveredColeopteraBruchidae19 Bruchus quadrimaculatus Fabricius2 Callosobruchus chinensis (Linn.)1 Acanthoscelides obtectus (Say)Bostrychidae10 Sinoxylon conigerum Gerst.Anthribidae2 Areocerus sp.Nitidulidae6 Carpophilus dimidiatus (Fab.)HemipteraCydnidae1 Geotomus pygmaeus DallasTwenty of the twenty-two beans found in the debris had eggs ofB. quadrimaculatus attached. The number of eggs per bean rangedfrom one to five; one bean, however, bore seventy-eight eggs.BI,ACKEYE COWPEA BEANS FROM THE THRESHER—3 1/10 OZS.The total number of beans in the sample was 436. Twenty-fivepercent bore eggs, either 1, 2 or 3 per bean, averaging 40 eggs per100 beans. The number of adult beetles which emerged from thesample is given below; the beetles were removed as they emerged.Species No.Bruchus quadrimaculatus 115Callosobruchus chinensis , 3Proc. Haw. Ent. Soc, Vol. XI, No. 2, July, 1942.168If the beetles had not been removed as they emerged, the beanswould undoubtedly have been ruined in due course.LIMA B£ANS (VARIETY UNKNOWN)No insects were recovered from the lima beans.These observations indicate the following points:1. Blackeye cowpea is highly susceptible to attack by Bruchusquadrimaculatus.2. The trash contains large numbers of the adult.3. Initial infestation occurs in the field before the beans areharvested.4. Lack of recognition of the injury likely to occur to Blackeyecowpea from bruchids could result in the complete destruction ofthe harvested crop.

Insects Associated With Freshly Threshed Dry Beans

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Insects Associated With Freshly Threshed Dry Beans

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