The pattern of cross-resistance to insecticides and juvenile hormone analogues in a diflubenzuron-resistant strain of the cotton leaf wormSpodoptera littoralisboisd

1983 ◽  
Vol 14 (3) ◽  
pp. 235-245 ◽  
Author(s):  
Mohsen A. El-Guindy ◽  
Mostafa M. Abdel-Sattar ◽  
Abdel Rahman M. El-Refai
Keyword(s):  
Juvenile Hormone ◽  
Resistant Strain ◽  
Cross Resistance ◽  
Cotton Leaf ◽  
Juvenile Hormone Analogues

Cross-resistance and Fitness Cost Analysis of Resistance to Thiamethoxam in Melon and Cotton Aphid (Hemiptera: Aphididae)

2020 ◽  
Vol 113 (4) ◽  
pp. 1946-1954 ◽  
Author(s):  
Huihui Zhang ◽  
Anqi Chen ◽  
Tisheng Shan ◽  
Wenyang Dong ◽  
Xueyan Shi ◽  
...  
Keyword(s):  
Juvenile Hormone ◽  
Resistant Strain ◽  
Fitness Cost ◽  
Relative Fitness ◽  
Cross Resistance ◽  
Resistance Pattern ◽  
Continuous Exposure ◽  
Cotton Aphid ◽  
Developmental Duration ◽  
The Cross

Abstract The melon/cotton aphid, Aphis gossypii Glover, is a notorious pest in many crops. The neonicotinoid insecticide thiamethoxam is widely used for A. gossypii control. To evaluate thiamethoxam resistance risk, a melon/cotton aphid strain with an extremely high level of resistance to thiamethoxam (>2,325.6-fold) was established after selection with thiamethoxam for 24 generations. Additionally, the cross-resistance pattern to other neonicotinoids and fitness were analyzed. The cross-resistance results showed the thiamethoxam-resistant strain had extremely high levels of cross-resistance against clothianidin (>311.7-fold) and nitenpyram (299.9-fold), high levels of cross-resistance against dinotefuran (142.3-fold) and acetamiprid (76.6-fold), and low cross-resistance against imidacloprid (9.3-fold). Compared with the life table of susceptible strain, the thiamethoxam-resistant strain had a relative fitness of 0.950, with significant decreases in oviposition days and fecundity and prolonged developmental duration. The molecular mechanism for fitness costs was studied by comparing the mRNA expression levels of juvenile hormone acid O-methyltransferase (JHAMT), juvenile hormone-binding protein (JHBP), juvenile hormone epoxide hydrolase (JHEH), ecdysone receptor (EcR), ultraspiracle protein (USP), and Vitellogenin (Vg) in the susceptible and thiamethoxam-resistant strains. Significant overexpression of JHEH and JHBP and downregulation of EcR and Vg expression were found in the thiamethoxam-resistant strain. These results indicate that A. gossypii has the potential to develop extremely high resistance to thiamethoxam after continuous exposure, with a considerable fitness cost and cross-resistance to other neonicotinoids.

Larva lights: A decade of photoaffinity labeling with juvenile hormone analogues

1994 ◽  
Vol 24 (8) ◽  
pp. 747-761 ◽  
Author(s):  
Glenn D. Prestwich ◽  
Kazushige Touhara ◽  
Lynn M. Riddiford ◽  
Bruce D. Hammock
Keyword(s):  
Juvenile Hormone ◽  
Photoaffinity Labeling ◽  
Juvenile Hormone Analogues

scholarly journals Development and silk production by silkworm larvae after topical application of methoprene

2002 ◽  
Vol 59 (3) ◽  
pp. 585-588 ◽  
Author(s):  
José Ednilson Miranda ◽  
Sérgio Antonio de Bortoli ◽  
Roque Takahashi
Keyword(s):  
Juvenile Hormone ◽  
Larval Instar ◽  
Negative Effects ◽  
Hormone Analogue ◽  
Insect Growth Regulators ◽  
Silkworm Larvae ◽  
Silk Production ◽  
Juvenile Hormone Analogues ◽  
Chemical Products ◽  
Silkworm Bombyx Mori

Juvenile hormone analogues have been tested as insect growth regulators in silkworm (Bombyx mori), seeking an increment of silk production. These chemical products, when applied in small or moderate rates, promote the extension of the last larval instar. To understand the physiologic consequences on silk production by the silkworm strain C115 x N108, the application of methoprene, a juvenile hormone analogue, was performed to evaluate its effects on larval development and silk production. Methoprene was topically applied 48h after the fourth larval ecdysis, on the dorsal integument of the 2nd thoracic segment of the insects, at seven rates between 0 and 20 ng a.i. Methoprene influenced positively the duration of the fifth instar and the weight gain of the insects. The application of 1ng methoprene resulted in the heaviest silkglands, cocoons, shell cocoons and pupae weights. Comparatively to the control, the increment on silk production (approximately 24%) by the use of 1ng methoprene was more accentuated than the corresponding negative effects on the cocooning rate (approximately 12%).

Effects of juvenile hormone mimics on the codling moth Cydia Pomonella (L.) (Lep., Olethreutidae)

1973 ◽  
Vol 63 (1) ◽  
pp. 7-16 ◽  
Author(s):  
I. Gelbič ◽  
F. Sehnal
Keyword(s):  
Juvenile Hormone ◽  
Laboratory Experiments ◽  
Cydia Pomonella ◽  
Codling Moth ◽  
The Other ◽  
Wide Range ◽  
Juvenile Hormone Analogues ◽  
Juvenile Hormone Mimics

AbstractLaboratory experiments with juvenile hormone analogues on Cydia pomonella (L.) showed that Cecropia C17 juvenile hormone (methyl 10,ll-epoxy-3,7,ll-trimethyl-2,6-dodecadienoate) was the most active of the 28 compounds tested. When applied to four-hour-old eggs at 0.1 μg/egg, the hormone caused 100% failure in embryogenesis, while the other compounds were at least five times less effective. Depending on the time since ecdysis and the dose, juvenile hormone mimics applied to last-instar larvae resulted in a wide range of intermediate forms. Against three-day-old last-instar larvae, the Cecropia C17 hormone gave 100% inhibition of development at a dose of 1 μg/larva, while three other compounds (methyl 10,11-epoxy-3,7,11-trimethyl-2,6-dodecadienoate, ethyl 11-chloro-3,7,11-trimethyl-2-dodecenoate and ethyl 3,7,11-tri-methyl-2,4-dodecadienoate) gave the same effect at 2–5 μg/larva. Against newly emerged adults, the last two compounds at 10–50 μg/insect reduced fecundity and fertility to 0–81% and 0–50%, respectively, of their normal levels.

Effects of 5 Juvenile Hormone Analogues Applied Topically to Cattle Naturally Infested with Hypoderma Larvae (Diptera: Oestridae)1

1975 ◽  
Vol 12 (5) ◽  
pp. 517-524
Author(s):  
R. L. Younger ◽  
J. E. Wright ◽  
H. E. Smalley ◽  
H. R. Crookshank ◽  
J. O. Norman
Keyword(s):  
Juvenile Hormone ◽  
Juvenile Hormone Analogues

PRELIMINARY STUDIES OF EFFECTS OF JUVENILE HORMONE ANALOGUES ON ADULT EMERGENCE OF BLACK FLIES (DIPTERA: SIMULIIDAE)

1973 ◽  
Vol 105 (3) ◽  
pp. 509-511 ◽  
Author(s):  
J. E. Cumming ◽  
B. McKague
Keyword(s):  
Juvenile Hormone ◽  
Adult Emergence ◽  
Complete Inhibition ◽  
Black Flies ◽  
Breeding Sites ◽  
Juvenile Hormone Analogues ◽  
Simulium Decorum

AbstractBreeding sites for Simulium venustum, Simulium arcticum, Simulium pugetense, Simulium hunteri, Simulium canadense, and Simulium decorum were found in the Vancouver area. Addition of juvenile hormone analogues to the rearing water of S. decorum resulted in virtually complete inhibition of adult emergence.

Control ofCacopsylla (Psylla) pyri(L.) (Stenorhyncha, Psyllidae) by juvenile hormone analogues

1997 ◽  
Vol 121 (1-5) ◽  
pp. 343-351 ◽  
Author(s):  
N. Baldassari ◽  
P. Baronio ◽  
V. Němec ◽  
M. Rejzek ◽  
Z. Wimmer
Keyword(s):  
Juvenile Hormone ◽  
Juvenile Hormone Analogues
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