If you want to read about some additional interelationships with yucca, the moth, and other insects, you might be interested in this article by Laura Hebert.Īcknowledgments: Thank you to Mary Ann Feist for help with this post. If you’re interested in a much more detailed review of yucca moths, you might like this article by Olle Pellmyr. So each species depends upon each other for survival, and both benefit from the relationship. Similarly, yucca moth larvae don’t feed on anything other than yucca seeds. When the larvae finish eating, they burrow out of the fruit – usually during rain events, interestingly – and burrow down into the ground to make their cocoon and wait until the next spring when the whole process plays out again.Īs far as anyone knows, and it’s been studied since the 1870’s, no other species besides the moth pollinates yucca flowers. Typically, there are more seeds than the larvae in a particular flower can eat (since the plant aborts flowers that are too heavily laden with eggs). When the eggs hatch, the larvae feed on yucca seeds within the fruit. This helps moderate the number of larva that hatch within each flower, and prevents the plant from aborting the flower altogether, which it will do if too many eggs are laid. The scent marker will tell later visitors that they’re not the first to reach the flower, and they will either lay fewer eggs than the first moth, or none at all, depending upon how many moths have left their scent already. Either way, before she leaves the flower, she marks it with a pheromone (a chemical other moths can sense). She may then return to the ovary of the same flower to lay more eggs or fly to another flower. Once the eggs are laid, she scrapes a small amount of pollen from her sticky ball with her tentacles, walks to the stigma of the flower, and packs the pollen into tiny depressions within the style. She opens a small hole in the ovary and lays her eggs inside. When she arrives at the second yucca flower, usually one that has very recently opened, she goes straight to the bottom to find the ovary. The yucca moth (Tegeticulla yuccasella) on soapweed yucca at The Nature Conservancy’s Niobrara Valley Preserve in north-central Nebraska. She then flies off to another yucca flower. As she collects the sticky pollen, the yucca moth packs it into a ball and sticks it under her head. Unlike most moth species, yucca moths have two short tentacles near their mouth that they use to scrape pollen from the anthers of the flower. When a female is ready to lay eggs, she first goes to a yucca flower to collect pollen. Each spring, adult moths emerge from underground cocoons and the males and females meet up with each other on yucca plants to mate. In the central United States, soapweed yucca ( Yucca glauca) is pollinated by a moth known as Tegeticulla yuccasella. The moth’s larvae depend on the seeds of the yucca plant for food, and the yucca plant can only be pollinated by the yucca moth. It’s a particularly important one because neither the yucca or the moth can survive without the other. It sounds too good to be true two species helping each other survive for millions of years – each getting as much as they give.įor more than 40 million years there has been a relationship between yucca plants and yucca moths.
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