Comparison of the responses of two predaceous mites, Typhlodromus pyri and Zetzellia mali, to variation in prey density

1993 ◽  
Vol 17 (11) ◽  
Author(s):  
AndrewB. Lawson ◽  
SandraJ. Walde
Keyword(s):  
Prey Density ◽  
Typhlodromus Pyri ◽  
Predaceous Mites ◽  
Zetzellia Mali

scholarly journals Effect of prey density on the functional and numerical responses of two species of predaceous mites (Acari: Phytoseiidae)

2003 ◽  
Vol 32 (3) ◽  
pp. 461-467 ◽  
Author(s):  
Paulo R. Reis ◽  
Elber O. Sousa ◽  
Adenir V. Teodoro ◽  
Marçal Pedro Neto
Keyword(s):  
Prey Density ◽  
Predaceous Mites

SOME ASPECTS OF THE BIOLOGY AND A LABORATORY LIFE TABLE OF THE ACARINE PREDATOR ZETZELLIA MALI

1977 ◽  
Vol 109 (9) ◽  
pp. 1275-1281 ◽  
Author(s):  
N. D. White ◽  
J. E. Laing
Keyword(s):  
Life Table ◽  
Age Distribution ◽  
Male Offspring ◽  
Panonychus Ulmi ◽  
Intrinsic Rate Of Increase ◽  
Laboratory Population ◽  
Net Reproductive Rate ◽  
Rate Of Increase ◽  
Predaceous Mites ◽  
Zetzellia Mali

AbstractA rearing technique was developed to study various aspects of the biology of Zetzellia mali (Ewing) in the laboratory. The rate of development of Z. mali feeding upon the phytophagous mite Aculus schlechtendali (Nalepa) was determined at 9°±1°C and 14°±1°C (56% R.H.), 19°±1°C (33%, 56%, 76%, and 97% R.H.), and 24°±1°C (51% R.H.). The average preovipositional and ovipositional periods for 16 female Z. mali were 1.5 and 9.4 days respectively and an average of 1.7 eggs per day were laid by these females. Z. mali was found to be arrhenotokous with unmated females producing only male offspring and mated females producing 2.6 females: 1 male offspring. Diapause in Z. mali was broken at 24°±1°C, 16L:8D) with egg deposition beginning after 11 days (51% and 76% R.H.) or 12 days (33% and 96% R.H.) when the adults feed upon the winter eggs of Panonychus ulmi (Koch).A life table was constructed for Z. mali and the intrinsic rate of increase (rm) was determined to be 0.109 female offspring/female/day. The mean generation time (T) was calculated to be 21.0 days and the net reproductive rate (R0) during this time was 10.04. The theoretical stable age distribution of the laboratory population of Z. mali at 19°±1°C, 56% R.H. was 59% eggs, 15% larvae, 7% protonymphs, 6% deutonymphs, and 13% adults.Comparison of the intrinsic rates of increase and prey consumption of Z. mali and other species of predaceous mites indicate that Z. mali is not as efficient a regulating agent of phytophagous mites as the phytoseiids.

THE INFLUENCE OF SPRAY PROGRAMS ON THE FAUNA OF APPLE ORCHARDS IN NOVA SCOTIA: XVIII. PREDATOR AND PREY POPULATIONS IN RELATION TO MITICIDES

1967 ◽  
Vol 99 (7) ◽  
pp. 689-696 ◽  
Author(s):  
K. H. Sanford ◽  
H. J. Herbert
Keyword(s):  
Nova Scotia ◽  
Typhlodromus Pyri ◽  
Panonychus Ulmi ◽  
High Population ◽  
Untreated Plot ◽  
Apple Orchards ◽  
Partial Control ◽  
Beneficial Insects ◽  
Predaceous Mites ◽  
Tolerable Level

AbstractOvex, tetradifon, and chlorbenside which are largely innocuous, and parathion which is more harmful, to beneficial insects and predaceous mites, have been used in apple orchards in Nova Scotia to control outbreaks of phytophagous mites. Dicofol is used at present but it is toxic to predaceous mites. Animert V-101 is effective against Panonychus ulmi (Koch) but is ineffective on most beneficial species. Dicofol and Animert V-101 initially reduced a high population of P. ulmi but were equally ineffective on predaceous insects. The latter chemical was innocuous to Typhlodromus pyri Scheuten and Vasates schlechtendali (Nal.) but gave partial control of P. ulmi. A similar high population of P. ulmi was reduced to a low level on a comparative untreated plot where a high number of predators was present. This reduction was evident 1 month later than on the treated plots. The overwintering numbers of P. ulmi in 1966 were below a commercially tolerable level on the three plots.

scholarly journals Prey Density Threshold and Tidal Influence on Reef Manta Ray Foraging at an Aggregation Site on the Great Barrier Reef

PLoS ONE ◽  
2016 ◽  
Vol 11 (5) ◽  
pp. e0153393 ◽  
Author(s):  
Asia O. Armstrong ◽  
Amelia J. Armstrong ◽  
Fabrice R. A. Jaine ◽  
Lydie I. E. Couturier ◽  
Kym Fiora ◽  
...  
Keyword(s):  
Great Barrier Reef ◽  
Prey Density ◽  
Barrier Reef ◽  
Tidal Influence ◽  
Aggregation Site ◽  
Manta Ray ◽  
Reef Manta Ray ◽  
Density Threshold
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