NDLI: On Aspects of Sampling Eldana Saccharina Walker ( Lepidoptera : Pyralidae ) Populations and Damage in Sugarcane

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On Aspects of Sampling Eldana Saccharina Walker ( Lepidoptera : Pyralidae ) Populations and Damage in Sugarcane

Content Provider	Semantic Scholar
Copyright Year	2013
Abstract	During 2000-2004 a series of field-based insecticide trials were conducted against the sugarcane borer Eldana saccharina Walker (Lepidoptera: Pyralidae) (Eldana) in carry-over cane. Opportunity was taken to re-analyse data assessing Eldana damage and larval numbers in the untreated plots of these trials. The aim was to examine trends in damage and populations over time and their sampling errors. In addition, the relationship between measures of damage was examined as well as position of damage over time. A sequential sampling plan was also developed. Results showed that over the period August to April, damage and larval numbers increased four and nine-fold, respectively. Also shown was that estimates of damage were more reliable than estimates of larval numbers (average r 2 0.71 and 0.64, respectively). The analysis revealed that there was a reasonable association between the measures ‘% internodes bored’ and ‘% stalks bored’ (r 2 0.39-0.83). Because the latter measure is the simpler of the two to assess, this association may allow a more rapid estimate to be made of the former, the critical measure associated with Eldana losses. Sampling error was highest in the initial surveys, (August) and lowest in the final surveys (April). Trends in the position of damage confirmed that most damage is restricted to the lower section of the stalk but that, over time, damage can occur higher up the stalk. A sequential sampling plan was developed based on the percentage of internodes bored and using the negative binomial distribution. This demonstrated the possible value of this technique in field sampling for Eldana.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.sasta.co.za/wp-content/uploads/Proceedings/2010s/2013-50Leslie.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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