scholarly journals Synergistic effect of a fungicide containing polyoxin B with insect growth regulators (IGRs) in the killing of common cutworm, Spodoptera litura (Lepidoptera: Noctuidae)

2008 ◽  
Vol 43 (2) ◽  
pp. 167-171 ◽  
Author(s):  
Toru Arakawa
Keyword(s):  
Synergistic Effect ◽  
Growth Regulators ◽  
Spodoptera Litura ◽  
Insect Growth Regulators ◽  
Insect Growth ◽  
Common Cutworm ◽  
Lepidoptera Noctuidae

scholarly journals COMPARATIVE BIOACTIVITY OF PLANT EXTRACTS AND SYNTHETIC INSECT GROWTH REGULATORS AGAINST Spodoptera litura (F.) (LEPIDOPTERA: NOCTUIDAE)

2019 ◽  
Vol 19 (2) ◽  
pp. 118
Author(s):  
Rosma Hasibuan ◽  
Purnomo Purnomo ◽  
Lestari Wibowo ◽  
Izzaturrijal Izzaturrijal ◽  
Jamalam Lumbanraja
Keyword(s):  
Growth Regulators ◽  
Spodoptera Litura ◽  
Leaf Extract ◽  
Experimental Period ◽  
Botanical Insecticides ◽  
Insect Growth Regulators ◽  
Insect Growth ◽  
Biological Variables ◽  
And Control ◽  
Acalypha Indica

Laboratory bioassays were conducted to compare the effects of the leaf extract of Acalypha indica  L. (Euphorbiaceae) with synthetic insect growth regulators (IGRs) triflumuron and buprofezin against Spodoptera litura (F.). The experiment was set up as a randomized complete block design (RCBD). The treatments were two concentrations of  A. indica extracts 1000 and 2000 ppm, two concentrations of  buprofezin 100 and 200 ppm, two  concentrations of triflumuron 120 and 240 ppm and control. Each treatment was replicated three times. Second instar larva of  S. litura  were used for the bioassays.  Mortality and biological variables of treated and control larvae were recorded daily. The results indicated that the application of A. indica extracts  and synthetic IGRs (buprofezin & triflumuron) significantly caused the S. litura  mortality throughout the experimental period. At first, the toxicity of triflumuron on larval S. litura was significantly higher compared to those of buprofezin and Acalypha indica leaf extract. However, at the end of experimental period all treatments caused high mortality on S. litura, and those all were significantly different from control. The treatments also caused abnorrmal growth in larval, pupal, and adult stages. While in the control, larvae molted into normal adults. The results indicated that the use of biorational control agents such as synthetic insect growth regulators (IGRs) and those based on naturally derived products such as botanical insecticides show promise as a potential tool in S. litura management programs.

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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