EVALUATION OF THE INSECT GROWTH REGULATORS METHOPRENE AND DIFLUBENZURON AGAINST FLOODWATER MOSQUITOES (DIPTERA: CULICIDAE) IN SOUTHWESTERN ONTARIO

1978 ◽  
Vol 110 (3) ◽  
pp. 319-324 ◽  
Author(s):  
C. S. Rodrigues ◽  
R. E. Wright
Keyword(s):  
Growth Regulators ◽  
Field Trials ◽  
Early Summer ◽  
Fourth Instar ◽  
Aedes Vexans ◽  
Insect Growth Regulators ◽  
Partial Control ◽  
Insect Growth ◽  
Average Temperature ◽  
Third Instar Larvae

AbstractIn field trials conducted at Guelph, Ont., methoprene (Altosid® SR-10) at 0.028 kg AI/ha (0.025 lb AI/ac) effectively controlled spring Aedes species following treatment of third- and fourth-instar larvae. However, when treated in the first to third instar, only partial control was obtained. The formulation remained active in the pools for 13 days during which time the average temperature was < 20°C. Methoprene also effectively controlled early-summer Aedes vexans (Meigen) after treatment of fourth-instar larvae. Diflubenzuron (Dimilin® 25% WP) at 0.022 kg AI/ha and 0.045 kg AI/ha (0.02 and 0.04 lb AI/ac) was effective against spring Aedes species following treatment of third-instar larvae.

Effect of insect growth regulators and fertilizers applied as foliar sprays during the egg stage of the sawfly Neodiprionsertifer

1976 ◽  
Vol 6 (4) ◽  
pp. 523-531 ◽  
Author(s):  
W. H. Fogal ◽  
C. R. Sullivan
Keyword(s):  
Growth Regulators ◽  
Larval Mortality ◽  
Field Trials ◽  
Insect Growth Regulator ◽  
Red Pine ◽  
Ovicidal Activity ◽  
Insect Growth Regulators ◽  
Geometrical Isomers ◽  
Egg Hatch ◽  
Insect Growth

Two insect growth regulators, a mixture containing about 25% Cecropia juvenile hormone with its geometrical isomers (AY-22342-3: Ayerst Research Laboratories, Saint-Laurent, Quebec) and a preparation containing 75% of the aromatic terpenoid ether, 4-ethylphenyl-6,7-epoxygeranyl ether (R-20458-B: Stauffer Chemical Co., Mountain View, California), were tested under field conditions for ovicidal activity against eggs of Neodiprionsertifer (Geoff.). Single egg clusters on Scots pine (Pinussylvestris L.) and whole red pine (P. resinosa Ait.) trees were sprayed to the drip point with formulations containing 0.1, 1, or 10 g/litre of insect growth regulator. AY-22342-3 reduced egg hatch at 10 g/litre on both tree species but was more effective in the red pine trial. R-20458-B did not reduce egg hatch significantly. Results with AY-22342-3 in the laboratory were about twice as effective as field trials. The application of fertilizers (urea, KNO3, or NH4NO3) accompanying a spray of AY-22342-3 on whole red pine trees does not enhance larval mortality. For trees receiving relatively intensive care, notably ornamentals and Christmas trees, the ovicidal activity of insect growth regulators might be useful as a means of preventing sawfly defoliation.

Alkylene-bis-isothiocyanates: Novel Insect Growth Regulators

1986 ◽  
Vol 41 (11-12) ◽  
pp. 1069-1072 ◽  
Author(s):  
György Matolcsy ◽  
István Ujváry
Keyword(s):  
Manduca Sexta ◽  
Histological Examination ◽  
Growth Regulators ◽  
Insect Control ◽  
Insect Growth Regulators ◽  
New Approach ◽  
Insect Growth ◽  
Selective Destruction ◽  
Starting Point ◽  
Third Instar Larvae

In search for selective anti-insect agents some mono- and bis-isothiocyanates were prepared and tested on third instar larvae of Manduca sexta. The alkylene-bis-isothiocyanates 4, 5 and 6 had a novel effect preventing formation of the abdominal spiracles and of the hooks (crochets) at the following molt to the 4th instar. Some of these larvae died in the molt, while spiracles remained absent also in the larvae which were able to molt to the 5th instar. Histological examination indicated a selective destruction of spiracle forming cells. This novel action might serve as starting point of a new approach in selective insect control.

Insect growth regulators. Analogs of TH-6038 and TH-6040

1976 ◽  
Vol 24 (5) ◽  
pp. 1065-1068 ◽  
Author(s):  
James E. Oliver ◽  
Albert B. DeMilo ◽  
Charles F. Cohen ◽  
Thomas J. Shortino ◽  
William E. Robbins
Keyword(s):  
Growth Regulators ◽  
Insect Growth Regulators ◽  
Insect Growth
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