Pyrenone, a pyrethrin (Bayer AG), was tested on coqui frog
eggs. Egg clusters or clutches (at least 4 days old) were
cleared of dead or infertile eggs and dissected into two masses;
one half was treated and the other served as untreated control.
A solution of Pyrenone (14 oz / 100 gal) was sprayed over
the egg masses, which were observed until hatching. Nearly
92% of the eggs that were treated with Pyrenone hatched, compared
to 97% among the untreated eggs.
For eggs at the ages tested (4-7 days after being
laid), Pyrenone does not seem to provide effective control.
Further testing on eggs at different ages, and of Pyrenone
in combination with other treatments, are being planned.