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  • 1990-1994  (2)
  • 1992  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Orientation of males of sorghum midge,Contarinia sorghicola to sex pheromones from virgin females in the field (1992)
    Springer
    Entomologia experimentalis et applicata 64 (1992), S. 23-29 
    Details
    ISSN: 1570-7458
    Keywords: Contarinia sorghicola ; sorghum midge ; sex pheromones ; orientation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The orientation of males of the sorghum midge,Contarinia sorghicola Coq. (Diptera: Cecidomyiidae) towards virgin female baited sticky traps was studied in the field. Male response increased linearly with an increase in the number of virgin females in the sticky traps. Five females per vial were optimum for monitoring midge populations in the field. Numbers of males trapped were significantly greater in traps placed at 0.5 and 1.5 m above ground level compared with those placed at 2.5 m. Peak trap catches occurred at 0900 h. The number of males trapped decreased significantly after 1400 h; male catches continued till sunset. Trap catches followed the same pattern as the number of ovipositing females on sorghum panicles at the half-anthesis stage. Midge activity decreased with an increase in temperature and a decrease in relative humidity. Peak midge density was observed during the second fortnight of October in the rainy season and during February-March in the post-rainy season. Sex pheromones can be used to monitor midge population dynamics for integrated pest management and to screen for host plant resistance to this insect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688990
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Genotypic effects of sorghum accessions on fecundity of sorghum head bug, Calocoris angustatus Lethiery (1992)
    Springer
    Euphytica 65 (1992), S. 167-175 
    Details
    ISSN: 1573-5060
    Keywords: Calocoris angustatus ; host-plant ; resistance ; fecundity ; grain damage ; sorghum ; sorghum head bug ; Sorghum bicolor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Sorghum head bug (Calocoris angustatus Leth.) (Hemiptera: Miridae) is an important pest of grain sorghum in India. We studied the fecundity of head bug females reared for one to three generations on head bug-resistant and head bug-susceptible genotypes during the 1988 and 1989 rainy and 1988–89 post-rainy seasons. Head bug population increase was lower for the first, second and/or third generation when the bugs were reared on IS 2761, IS 19955, IS 14334, IS 23748, IS 16357, IS 17610, and IS 21444 compared with the susceptible controls CSH 1, CSH 5, and CSH 9. These genotypes also suffered a low grain damage (damage rating (DR) ≤5) (except IS 2761) compared with the susceptible controls (DR〉6). A marginal decrease in fecundity was observed when the bugs were reared on IS 2761, IS 14334, IS 16357, IS 20740 and IS 17610 and then transferred to the susceptible control, CSH 1. Sorghum genotypes having lower increase in bug population across generations, suffering low grain damage, and showing adverse effects on fecundity can be used in breeding for resistance to head bugs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023080
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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