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Abstract
Variation in fecundity of apterous adults of three greenbug, Schizaphis graminum (Rondani), biotypes on seedlings of resistant and susceptible barley was studied in an environmental chamber programmed for 25:20°C and 16:8 (L:D) h. The objective of the test was to obtain baseline data on variability of biotypes B, C, and E on resistant and susceptible cultivars. Fecundity distributions for three biotypes (B, C, and E) on susceptible ‘Wintermalt’ were normal, but non-normality was evident for the three biotypes on resistant ‘Post’. For the non-normal distributions, significant skewness values were found in the direction of higher fecundity. Greenbug reproduction on some plants of ‘Post’ barley was greater than expected, but whether this was caused by variation in greenbug populations or variation in the host plants is unclear.
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