Effects of Selected Insect Growth Regulators on Longevity and Mortality of Corn Earworm and Fall Armyworm (Lepidoptera: Noctuidae) Larvae

1992 ◽  
Vol 85 (5) ◽  
pp. 1972-1978 ◽  
Author(s):  
L. D. Chandler ◽  
S. D. Pair ◽  
J. R. Raulston
Keyword(s):  
Growth Regulators ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Insect Growth Regulators ◽  
Insect Growth ◽  
Lepidoptera Noctuidae

Effects of Sublethal Doses of Two Insect Growth Regulators on Helicoverpa zea (Lepidoptera: Noctuidae) Reproduction2

1994 ◽  
Vol 29 (3) ◽  
pp. 428-435 ◽  
Author(s):  
J. E. Carpenter ◽  
L. D. Chandler
Keyword(s):  
Growth Regulators ◽  
Lower Incidence ◽  
Helicoverpa Zea ◽  
Sperm Transfer ◽  
Insect Growth Regulators ◽  
Insect Growth ◽  
Pinto Bean ◽  
Sublethal Doses ◽  
Ecdysone Agonist ◽  
Lepidoptera Noctuidae

The effects of sublethal doses of two insect growth regulators on Helicoverpa zea (Boddie) reproduction were investigated. Adults which developed from larvae that fed on a pinto bean diet containing diflubenzuron (Dimilin) or an ecdysone agonist (RH 5992) were inbred and outcrossed with adults which developed from larvae that were fed on a normal pinto bean diet. Data were collected on fecundity, fertility, and sperm transfer. Sublethal doses of both compounds administered to H. zea larvae caused reduced fertility in surviving male imagos but had no effect on fecundity or fertility of the female imagos. Reduced fertility in treated males was largely caused by a lower incidence of sperm transfer. Implications of our results for H. zea population management are discussed.

Comparative Effects of Insect Growth Regulators on Longevity and Mortality of Beet Armyworm (Lepidoptera: Noctuidae) Larvae2

1994 ◽  
Vol 29 (3) ◽  
pp. 357-366 ◽  
Author(s):  
L. D. Chandler
Keyword(s):  
Growth Regulators ◽  
Spodoptera Exigua ◽  
Toxic Effects ◽  
Beet Armyworm ◽  
Insect Growth Regulators ◽  
Insect Growth ◽  
Lepidoptera Noctuidae ◽  
Laboratory Bioassays

Laboratory bioassays demonstrated the toxic effects of three distinct types of insect growth regulators, diflubenzuron, fenoxycarb, and RH-5992, against 1- and 6-d-old larvae of the beet armyworm, Spodoptera exigua (Hübner). Diflubenzuron and RH-5992 were somewhat more active and provided faster knockdown of beet armyworm larvae than did fenoxycarb. RH-5992 and diflubenzuron were 12–21 and 3–5 times more effective, respectively, against beet armyworm larvae than fenoxycarb. Larvae exposed to fenoxycarb lived up to 34 d following treatment and continued to feed. Therefore, fenoxycarb in field settings may not be as acceptable for controlling larvae of the beet armyworm as are diflubenzuron and RH-5992.

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