“…The thermal optimum for embryogenesis is between 18 and 20 ° C and the process is irreversibly inhibited at 27 ° C. If high temperatures supervene during egg laying and embryogenesis, egg mortality will be high, galls will contain eggs but no larvae, and there will be diminished pasture toxicity the following season. 39,[41][42][43] The L2 that hatch commence to feed and grow into the resistant or dauer stage. The growth of these L2 during the late spring leads to dramatic changes occurring in the gall at the expense of the adult nematodes, which subsequently degenerate.…”