Impact of Spartina sp. on P. marginata development times under glasshouse conditions

Two male and two female newly-emerged adult P. marginata were caged on each of twelve plants of each of the four Spartina species. Cages were monitored for 64 days to determine the date of first egg hatch, the date of first adult emergence and the date by which all adults had emerged. At the end of the experimental period, all P. marginata remaining in each cage were counted and the above-ground material of all plants was harvested by cutting at ground level, dried and weighed.