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Three distinct patterns of virulence in Bremia lactucae were identified in samples of lettuce downy mildew collected between 2005 and 2010 in Australia. These are unique to Australia and it is proposed they be named AUS4, AUS5 and AUS6.
The purpose of this paper is to study continuity of the parametriza-tion of continuous-time linear time-invariant differential systems having a finite-dimensional state space. We show that convergence of the behavior of such systems corresponds to convergence of the coefficients of a set of associated differential equations. For this to hold, both the… (More)
It is argued that due to inconsistencies in existing methods to approximate the prices of equity options on assets which pay out fixed cash dividends at future dates, a new approach to this problem may be useful. Logically consistent methods which are guaranteed to exclude arbitrage exist, but they are not very popular in practice due to their computational… (More)
In a split root experiment translocation of N from shoot to root was studied using15NO 3 − . The three plant species selected for this experiment differed significantly with respect to root NRA. For lupin, maize and cocklebur about 80, 50 and 6% of all absorbed NO 3 − was assmilated in the roots, respectively. Although NO 3 − was reduced in the roots of… (More)