Quantification of insect growth and its use in screening of naturally occurring insect control agents

1993 ◽  
Vol 19 (6) ◽  
pp. 1109-1118 ◽  
Author(s):  
Minli Zhang ◽  
Swapan K. Chaudhuri ◽  
Isao Kubo
Keyword(s):  
Insect Control ◽  
Insect Growth ◽  
Naturally Occurring

The Value of Physical Factors in Insect Control

1964 ◽  
Vol 96 (1-2) ◽  
pp. 114-114
Author(s):  
P. Belton ◽  
M. G. Maw
Keyword(s):  
Insect Control ◽  
Physical Factors ◽  
New Methods ◽  
Naturally Occurring ◽  
Pressure Changes ◽  
Rapid Pressure ◽  
Methods Of Control

For several years we have been investigating the effects of natural and artificial acoustical and electrical phenomena on the behaviour of insects with a view to the development of new methods of control.A. Sounds can be exploited in two ways:–firstly to affect insects whose behaviour is stimulated by naturally-occurring sounds; secondly to use the very rapid pressure changes associated with sounds as a sort of “death ray.”

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.

Pathology of Bone Cells in Pigs with Experimental Turbinate Osteoporosis (Atrophic Rhinitis)

1971 ◽  
Vol 29 ◽  
pp. 304-305
Author(s):  
A. W. Fetter ◽  
C. C. Capen
Keyword(s):  
Mucous Membrane ◽  
Bone Cells ◽  
Atrophic Rhinitis ◽  
Infectious Agents ◽  
Metabolic Disturbances ◽  
Progressive Reduction ◽  
Naturally Occurring ◽  
Fundamental Cause ◽  
Osteocytic Osteolysis ◽  
Uncertain Etiology

Atrophic rhinitis in swine is a disease of uncertain etiology in which infectious agents, hereditary predisposition, and metabolic disturbances have been reported to be of primary etiologic importance. It shares many similarities, both clinically and pathologically, with ozena in man. The disease is characterized by deformity and reduction in volume of the nasal turbinates. The fundamental cause for the localized lesion of bone in the nasal turbinates has not been established. Reduced osteogenesis, increased resorption related to inflammation of the nasal mucous membrane, and excessive resorption due to osteocytic osteolysis stimulated by hyperparathyroidism have been suggested as possible pathogenetic mechanisms.The objectives of this investigation were to evaluate ultrastructurally bone cells in the nasal turbinates of pigs with experimentally induced atrophic rhinitis, and to compare these findings to those in control pigs of the same age and pigs with the naturally occurring disease, in order to define the fundamental lesion responsible for the progressive reduction in volume of the osseous core.

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