caa a22 4500 386375887 CHVBK 20180307112018.0 cr unu---uuuuu 161130e198904 xx s 000 0 eng 10.1017/S1742758400010353 doi S1742758400010353 pii (NATIONALLICENCE)cambridge-10.1017/S1742758400010353 Species composition and injury to sorghum by panicle feeding bugs in Niger [Elektronische Daten] Eurystylus marginatus Odhiambo (Hemiptera: Miridae) was the most important and abundant insect pest of sorghum panicles in Niger in 1985 and 1986. First generation adults initially infested sorghum panicles in late August, and two succeeding generations developed on sorghum. Economic losses were manifested in yield and grain quality reduction. A commonly grown indigenous variety Mota Galmi, suffered 14% yield loss and 19% grain vitrosity reduction in field trials in which E. marginatus density averaged 80/panicle. Among 14 other sorghum varieties grown under natural conditions, vitrosity was decreased 20% on average (range 0-47%). Headcage experiments using 20 female/male pairs of E. marginatus on each of three varieties resulted in losses ranging from 19-62% of grain weight/panicle, 1000-kernel weight, per cent low density grain, and vitrosity. Damage resulted from both oviposition and feeding. Among seven panicle and glume characteristics, percentage coverage of grain surface by glumes, and the time from anthesis to opening of the glumes were significantly correlated with reduced head bug numbers. Among varieties, grain damage was not highly correlated with head bug numbers; but within varieties, increasing head bug numbersclearly caused increased damage. Measureable damage occurred with as few as five female/male head bug pairs per panicle. MostE. marginatus eggs were oviposited into exposed, apical portions of sorghum grains during the milky stage of kernel development. Grain of variety CE90 were vulnerable to oviposition for less than 1 week after glumes opened. Copyright © ICIPE 1989 Eurystylus marginatus nationallicence sorghum nationallicence headbugs nationallicence Eurystylus marginatus nationallicence sorgho nationallicence punaises du sorgho nationallicence Steck G. J. Department of Entomology, Texas A&M University, College Station, TX 77843, U.S.A. Teetes G. L. Department of Entomology, Texas A&M University, College Station, TX 77843, U.S.A. Maiga S. D. Institut National de Recherche Agronomique du Niger, B.P. 240, Maradi, Niger International Journal of Tropical Insect Science Cambridge University Press 10/2(1989-04), 199-217 1742-7584 10:2<199 1989 10 JTI https://doi.org/10.1017/S1742758400010353 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1742758400010353 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Steck G. J. Department of Entomology, Texas A&M University, College Station, TX 77843, U.S.A NATIONALLICENCE 700 1- Teetes G. L. Department of Entomology, Texas A&M University, College Station, TX 77843, U.S.A NATIONALLICENCE 700 1- Maiga S. D. Institut National de Recherche Agronomique du Niger, B.P. 240, Maradi, Niger NATIONALLICENCE 773 0- International Journal of Tropical Insect Science Cambridge University Press 10/2(1989-04), 199-217 1742-7584 10:2<199 1989 10 JTI CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge