Journal of Economic Entomology (1997) 90, 1702-1709

P.G. Allsopp and N.G. McGill (1997)
Variation in resistance to Eumargarodes laingi (Hemiptera: Margarodidae) in Australian sugarcane
Journal of Economic Entomology 90 (6), 1702-1709
Abstract: The responses of 24 commercial cultivars and 1 experimental clone of sugarcane to the margarodid Eumargarodes laingi Jakubski were evaluated over the plant and 3 ratoon crops of a field trial in southern Queensland. Clones varied, in the number of cysts that developed with lowest numbers on Q147 and Q135. This effect was similar over all 4 crops and, indicates the presence of antibiosis or antixenosis. Clones also varied in the cane and sugar yields and sugar contents, with QI36, Q145, Q147, and Q138 giving the highest cane and sugar yields. Outliers from a general cyst numbers versus yield relationship indicate that cultivars such as Q145, Q138, Q155, Q154, and Q124 may have good tolerance and that Q68 and CP44-101 may be particularly sensitive to E. laingi. Although there were significant quantitative differences between clones in yields over the 4 crops, the rankings for yield components and for cyst numbers did not differ significantly between crops. Hence, clones could be, selected for resistance to E. laingi on the basis of data from 1 or 2 yr. However, clones that showed good antibiosis/ antixenosis resistance to E. laingi showed poor resistance to the root pathogen Pachymetra chaunorhiza, and this may provide a conflict in the breeding program. Combining cultivars such as Q147, Q135, and Q138 with other cultural controls should minimize the detrimental impact of E. laingi on sugar production.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Eumargarodes laingi	Sugarcane (Saccharum officinarum)	Australia (NT+QLD)