170
N. W U F F
condemns its own progeny, or at least individuals of its own specim to
death”. Thus, whereas the long range regulation of numbers depended
on the interactions between the parasites and hosts in previous generations, the immediate effect of increase in the numbers of L. heterocordyli
resulted in intrllspecific competition of the wasps for oviposition sibs
and of their larval progeny for the requieites within the hasmoooeles of
their hosts.
1 H. tibklis
80
obrdetum
Log max. no. nymphs
Fro. 11. Logarithms of maximum numbem of nymphs of H. tibialie end A . obeokfum
and yo paresitism by Leicvphron spp., 1959-66 (from Waloff, N. (1987). T r w . R. cnt.
SOC. LO&. 119, 187-213).
L. ortbtyli parmitima both the early hatching Asc~odenaa and the
late 0. wirescens. I n the laboratory adult w a s p emerged earlier from
the early host and vice versa. Two waves of emergence have also been
detected in the field. Either the waspa are very sensitive to the physiology of their hosta, or they are polymorphio in their developmental
rates. Previously we also detected developmental polymorphism in
Perilitue dubius (Wesm.), the univoltine braconid parasita of Phytodech
o l i v w (Richards and Waloff, 1961), which emerge6 in two waves and
parmitiees the spring and the autumn beetles.
The main period of emergence of L. & M y & in the field coincided
well with that of Asciodemcz, but the wasps were much ec&rcer by the
time 0. virescem nymphs reached their maximum. It w m s that
L. orthotyli is well adjusted to Asc~odemcz, it ia lesa well geared to its
second common host, 0. virescens. However, there is a &-cross
relationship between the numbere of this braconid and its two main
N. W U F F
condemns its own progeny, or at least individuals of its own specim to
death”. Thus, whereas the long range regulation of numbers depended
on the interactions between the parasites and hosts in previous generations, the immediate effect of increase in the numbers of L. heterocordyli
resulted in intrllspecific competition of the wasps for oviposition sibs
and of their larval progeny for the requieites within the hasmoooeles of
their hosts.
1 H. tibklis
80
obrdetum
Log max. no. nymphs
Fro. 11. Logarithms of maximum numbem of nymphs of H. tibialie end A . obeokfum
and yo paresitism by Leicvphron spp., 1959-66 (from Waloff, N. (1987). T r w . R. cnt.
SOC. LO&. 119, 187-213).
L. ortbtyli parmitima both the early hatching Asc~odenaa and the
late 0. wirescens. I n the laboratory adult w a s p emerged earlier from
the early host and vice versa. Two waves of emergence have also been
detected in the field. Either the waspa are very sensitive to the physiology of their hosta, or they are polymorphio in their developmental
rates. Previously we also detected developmental polymorphism in
Perilitue dubius (Wesm.), the univoltine braconid parasita of Phytodech
o l i v w (Richards and Waloff, 1961), which emerge6 in two waves and
parmitiees the spring and the autumn beetles.
The main period of emergence of L. & M y & in the field coincided
well with that of Asciodemcz, but the wasps were much ec&rcer by the
time 0. virescem nymphs reached their maximum. It w m s that
L. orthotyli is well adjusted to Asc~odemcz, it ia lesa well geared to its
second common host, 0. virescens. However, there is a &-cross
relationship between the numbere of this braconid and its two main