Resistance modality of hybrid sorghum to sorghum midge.
Using the sorghum midge, Contarinia sorghicola (Coq.), resistant hy-brid ATx2755 X Tx2767 and the susceptible hybrid ATx2752 X Tx430 several aspects of the resistance were examined under field conditions from 1982 to 1984 at College Station, Texas. Based on the number of oviposition adult midges trapped per flowering panicle, about 1/3 more female midges visited flowering panicles of the susceptible hybrid than the resistant. In addition, comparing the number of eggs laid by 20 caged females, it was shown that 4-5 times more eggs were laid in spikelets of the susceptible hybrid than spikelets of the resistant hybrid.Although and equivalent proportion of eggs was laid during and before anthesis in spikelets of both hybrids, a significantly lower proportion of eggs was laid in flowers of the resistant hybrid after anthesis. There aspects of adult ovipositional behavior were determined. About 25% more females were trapped on flowering panicles which had not been previously midge infested compared to when panicles had already been infested. Sorghum midge females searched the flowers of the resistant hybrid more rapidly than they did the susceptible; however, the time used attempting to oviposite waslonger. Also, the frequency of ovipositional sucess was much lower, about 4 times, in flowers of the resistant hybrid than in flowers of the susceptible hybrid. Development of midge immature stages in the spikelet of the resistant hybrid was affected.
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| Format: | Parte de livro biblioteca |
| Language: | English eng |
| Published: |
2011-04-10T11:11:11Z
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| Subjects: | Sorghum, Resistant, Hybrid, Sorghum midge, Modality, Modalidade., Hibrido, Resistência, Sorgo., |
| Online Access: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/472488 |
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