Economic Injury Levels for Sorghum Midge, Stenodiplosis sorghicola1,and Corn Earworm, Helicoverpa zea2, Feeding on Panicles of Sorghum, Sorghum bicolor

This experiment examined the association between the level of sorghum midge resistance of a grain sorghum hybrid and its ultilisation by cattle. Twenty-five Hereford steers were placed in individual pens and fed a feedlot ration (80% grain) for 8 weeks containing 1 of the following grain sorghum hybrids: Pacific 810, DK55plus (susceptible to midge); Barrier (low resistance to midge); AQL39/QL36, DK470 (moderate resistance to midge). There was no significant (P>0.05) difference between the hybrids in dry matter intake, liveweight gain, feed conversion efficiency, apparent nitrogen digestibility, and digestibility of the dry matter. No tannins were detected in the grain of any of the hydrids. It was concluded that the development of grain sorghum hybrids resistant to sorghum midge will not affect the utilisation of the grain in steers.

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Resistance to sorghum midge (Contarinia sorghicola Coquillet) in grain sorghum

Australian Journal of Experimental Agriculture ◽

10.1071/ea9790097 ◽

1979 ◽

Vol 19 (96) ◽

pp. 97 ◽

Cited By ~ 10

Author(s):

FD Page

Keyword(s):

Sorghum Bicolor ◽

Seed Set ◽

Grain Sorghum ◽

Breeding Program ◽

Contarinia Sorghicola ◽

Breeding Lines ◽

Sorghum Midge

Standardized levels of infestation of sorghum midge Contarinia sorghicola Coquillet were used to compare the levels of resistance in sorghum cultivars (Sorghum bicolor) in glasshouse experiments at Biloela in Central Queensland. Sorghum heads were reduced to 250 florets and ten female midges were caged over each head on three consecutive days during anthesis. Two breeding lines from the U.S.A., IS 12608C and IS 12664C were superior (P < 0.01) to Alpha and KS 19 in percentage seed set and number of midge progeny produced. The percentage seed set was 50, 54, 22, 12 for IS 12608C, IS 1664C, Alpha and KS 19, respectively. The Indian line Q 13828 was susceptible. Testing with a standardized level of infestation is a useful technique for screening parents in a breeding program aimed at incorporation of midge resistance into agronomically useful hybrid cultivars.

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Economic Injury Level of the Sugarcane Borer (Lepidoptera: Pyralidae) on Sweet Sorghum, Sorghum bicolor (L.) Moench

Journal of Economic Entomology ◽

10.1093/jee/81.1.349 ◽

1988 ◽

Vol 81 (1) ◽

pp. 349-353 ◽

Cited By ~ 6

Author(s):

B. W. Fuller ◽

T. E. Reagan ◽

J. L. Flynn

Keyword(s):

Sorghum Bicolor ◽

Sweet Sorghum ◽

Economic Injury Level ◽

Sugarcane Borer ◽

Economic Injury ◽

Lepidoptera Pyralidae ◽

Sorghum Bicolor L

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Host-plant resistance and biopesticides: ingredients for successful integrated pest management (IPM) in Australian sorghum production

Australian Journal of Experimental Agriculture ◽

10.1071/ea08071 ◽

2008 ◽

Vol 48 (12) ◽

pp. 1594 ◽

Cited By ~ 12

Author(s):

B. A. Franzmann ◽

A. T. Hardy ◽

D. A. H. Murray ◽

R. G. Henzell

Keyword(s):

Pest Management ◽

Corn Earworm ◽

Social Benefits ◽

Practical Application ◽

Beneficial Arthropods ◽

Resistance Development ◽

Stenodiplosis Sorghicola ◽

Sorghum Midge ◽

The Past ◽

Sorghum Production

There are two major pests of sorghum in Australia, the sorghum midge, Stenodiplosis sorghicola (Coquillett), and the corn earworm, Helicoverpa armigera (Hübner). During the past 10 years the management of these pests has undergone a revolution, due principally to the development of sorghum hybrids with resistance to sorghum midge. Also contributing has been the adoption of a nucleopolyhedrovirus for the management of corn earworm. The practical application of these developments has led to a massive reduction in the use of synthetic insecticides for the management of major pests of sorghum in Australia. These changes have produced immediate economic, environmental and social benefits. Other flow-on benefits include providing flexibility in planting times, the maintenance of beneficial arthropods and utilisation of sorghum as a beneficial arthropod nursery, a reduction in midge populations and a reduction in insecticide resistance development in corn earworm. Future developments in sorghum pest management are discussed.

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Compensation for reduction in seed set due to sorghum midge (Contarinia sorghicola) in midge-susceptible and midge-resistant sorghum (Sorghum bicolor)

Australian Journal of Experimental Agriculture ◽

10.1071/ea9930193 ◽

1993 ◽

Vol 33 (2) ◽

pp. 193 ◽

Cited By ~ 1

Author(s):

BA Franzmann ◽

DG Butler

Keyword(s):

Sorghum Bicolor ◽

Seed Set ◽

Grain Sorghum ◽

Percentage Increase ◽

Contarinia Sorghicola ◽

Sorghum Midge ◽

Damage Compensation ◽

Wide Range ◽

The Relationship ◽

Resistant Genotypes

The relationship between percentage seed set on grain sorghum (Sorghum bicolor) panicles damaged by sorghum midge, Contarinia sorghicola (Coquillett), and percentage compensation (percentage increase in weight) of undamaged seed was examined in 11 experiments covering a wide range of environmental variation and incorporating various sorghum midge susceptible and resistant genotypes. In contrast to previous findings where negative compensation was found after sorghum midge damage, compensation was generally positive, but the slope of the response with respect to seed set changed from positive to negative as seed set increased to >30-50%. Expression of the relationship was similar for susceptible and resistant genotypes. The slope of the relationship for seed sets above the point of maximum compensation was -0.51 for sorghum midge susceptible hybrids, -0.42 for resistant genotypes (various lines and hybrids), and -0.38 for resistant hybrid ATx2755/RTx2767. The pooled slope was -0.45.

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