The E. W. Heier Teaching Greenhouse was selected by the Broome County Legislature to be recognized in the 2009 Green Business Initiatives for "exemplary leadership and innovative practice to improve and protect our environment, and for instituting a policy in which beneficial insects are used as a means of pest control. The E.W. Heier Teaching Greenhouse has, through their research, advanced the field of non-chemical pesticides, which will benefit the people of Broome County and beyond."
In February of 2008 we started the introduction of beneficial insects into the E.W.Heier Teaching Greenhouse for biological pest control. Biological pest control is the use of an organism to attack harmful insects. They could be predators, parasites, or even diseases.
We started with four species of beneficial insects, which are any insect that preys on a harmful insect in the greenhouse. We chose to start with a parasitic wasp for our sweet potato whitefly - Eretmocerus; a parasitic spider mite for our two-spotted spider mite - P. persimilis; the "Mealy Bug Destroyer" beetle for our mealybug - Cryptolaemus montrouzieri; and the lacewing larvae for the mealybug - C. rufilabris.
Why Use Beneficial Insects? Crypt Larvae & Mealybugs. Both adult & larval crypts feed on mealybugs. We primarily released them into the Warm Temperate Room. Releases throughout the greenhouse are scheduled for September.
Overtime many pests can become resistant to chemical pesticides, rendering them ineffective. Prolonged exposure to pesticides is harmful for the applicant and the pesticides leave a residue on the plant. Initial costs of beneficials may exceed pesticide costs, but over time the costs for pest control with beneficials is far below that of pesticides.
We are striving for a clean, green friendly environment with a self sustaining beneficial population.
Crypt adult after release into the Desert Room in July 2008. It is surrounded by plenty of food - egg masses of the citrus mealybug as well as adult citrus mealybug.
Our population of sweet potato whiteflies has decreased noticeably after the introduction of the Eretmocerus to selected infested plants. We are catching this tiny wasp on the yellow sticky cards so the population is still in the greenhouse. More will be added in September.
The very tiny parasitic mite, P. persimilis appears to have cleared up signs of two-spotted mites on the selected plants it was scattered over. These cannot be seen with the naked eye so determining a present population is harder to do. We will introduce more in September.
The most noticeable are the Crypts - Cryptolaemus. These tropical lady bug beetles did remain in the greenhouse after release and we discovered many crypt larvae among the plants in the Warm Temperate and the Desert Rooms. We watched them develop through their 3 enstars, but only witnessed a handful of adults. The forming adults in the Desert Room appeared to have been halted in their development - perhaps attacked by another predator?
There is an opportunity for Seniors to undertake an Independent Research Project in the Greenhouse pertaining to the Beneficial Insects. The student would work under the auspices of a faculty member of the Department of Biological Sciences.
Last Updated: 9/13/10