Effect of Insect Growth Regulators on Citrus Mealybug
HORTSCIENCE 38(7):1397–1399. 2003. a result of insecticide applications is referred to as “hormoligosis” (Luckey, 1968). Hor- moligosis has been implicated in the increase Effect of Insect Growth Regulators on of female fecundity in several insect species such as Scirtothrips citri(Moulton) (Morse and Citrus Mealybug [Planococcus citri Zareh, 1991), Callosobruchus maculatus (F.) (Lale 1991), Zabrotes subfasciatus(Boheman), (Homoptera: Pseudococcidae)] Egg andAcanthoscelides obtectus(Say) (Weaver et al., 1992). Low doses of conventional insecti- cides have been implicated in increasing the Production fecundity of certain pests, including Coccus Raymond A. Cloyd hesperidum (L.) (Hart et al., 1966). In addi- tion to increasing egg production, insecticides University of Illinois, Department of Natural Resources and Environmental may also alter insect sex ratios (Dittrich et Sciences, 384 National Soybean Research Laboratory, 1101 West Peabody al., 1974). Drive, Urbana, IL 61801 Some insect growth regulators that act as juvenile hormone mimics reduce reproduction Additional index words. coleus, insect growth regulators, kinoprene, pyriproxyfen, by sterilizing females (Hamlen, 1977). In fact, buprofezin, novaluron, azadirachtin, interiorscapes, mealybugs insect growth regulators have been shown to Abstract. Greenhouse trials were conducted in 2000–2001 to evaluate the indirect effects of drastically reduce the fecundity of beneficial insects such as the ladybird beetles, Adalia insect growth regulators, whether stimulatory or inhibitory, on the egg production of female bipunctata Coccinella septempunctata citrus mealybug [Planococcus citri(Risso)]. Green coleus [Solenostemon scutellarioides (L.) L. and Codd] were infested with 10 late third instar female citrus mealybugs. The insect growth L. (Olszak et al., 1994). Regardless, there is still regulators kinoprene, pyriproxyfen, azadirachtin, buprofezin, and novaluron were applied minimal information on the potential indirect to infested plants at both the high and low manufacturer recommended rates.
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