Occurrence and Food of Some Coccinellids (Coleoptera) in Ontario Peach Orchards

1964 ◽  
Vol 96 (9) ◽  
pp. 1149-1155 ◽  
Author(s):  
Wm. L. Putman
Keyword(s):  
Myzus Persicae ◽  
Second Generation ◽  
Green Peach Aphid ◽  
Adalia Bipunctata ◽  
Panonychus Ulmi ◽  
Population Densities ◽  
European Red Mite

AbstractTen species of the larger, primarily aphidophagous, coccinellids were present in peach orchards of the Niagara Peninsula. Adalia bipunctata (L.) and Coccinella trifasciata perplexa Mulsant were the commonest. All were most numerous in the spring while the green peach aphid, Myzus persicae (Sulzer), was present but their population densities were low at all times, apparently because suitable prey was scarce. They were not attracted to dense populations of the European red mite, Panonychus ulmi (Koch), and were of no importance as predators of peach pests.At least 7 species were bivoltine but the second generation was only partial.

SAMPLING SYSTEMS FOR EUROPEAN RED MITE, PANONYCHUS ULMI (ACARINA: TETRANYCHIDAE), EGGS ON APPLE IN NOVA SCOTIA

1973 ◽  
Vol 105 (12) ◽  
pp. 1519-1523 ◽  
Author(s):  
H. J. Herbert ◽  
K. P. Butler
Keyword(s):  
Nova Scotia ◽  
Apple Orchard ◽  
Panonychus Ulmi ◽  
Population Estimates ◽  
Population Densities ◽  
European Red Mite ◽  
Tree Population ◽  
Sampling Systems ◽  
Mature Apple ◽  
Whole Tree

AbstractA study was conducted in a mature apple orchard in Nova Scotia to compare the density of eggs of the European red mite, Panonychus ulmi (Koch), over the whole tree to their density on a selected area using a random selection and standard selection technique. Both methods provided nearly equivalent estimates of population densities for generations 2 and 4 but not for generation 3. The population estimates based on sampling from the selected area overestimated the whole tree population.Optimum allocation of sampling resources may be obtained by sampling a small number of clusters from each of a large number of trees.

COMPARISONS BETWEEN AN EXOTIC AND AN ENDEMIC PHYTOSEIID MITE PREDATOR (ACARINA: PHYTOSEIIDAE) IN BRITISH COLUMBIA

1974 ◽  
Vol 106 (7) ◽  
pp. 773-776 ◽  
Author(s):  
R. S. Downing ◽  
T. K. Moilliet
Keyword(s):  
British Columbia ◽  
Resistant Strain ◽  
Panonychus Ulmi ◽  
Phytoseiid Mite ◽  
Population Densities ◽  
Amblyseius Fallacis ◽  
European Red Mite ◽  
Mite Predator ◽  
Phytoseiid Predator

AbstractIn 1972, an organophosphate resistant strain of the phytoseiid predator Amblyseius fallacis (Garman) from Michigan compared favourably with the endemic Typhlodromus occidentalis Nesbitt, from Summerland, B.C., in laboratory and greenhouse trials against European red mite, Panonychus ulmi (Koch), and was later released into an orchard. By August 1972, A. fallacis had decreased whereas population densities of T. occidentalis increased. Examination of leaves and bark from the trees, and weeds, grass, and litter beneath the trees in 1973 confirmed that A. fallacis failed to survive in the Okanagan environment.

CONTAGIOUS DISTRIBUTION IN THE EUROPEAN RED MITE, PANONYCHUS ULMI (KOCH), AND A METHOD OF GRADING POPULATION DENSITIES FROM A COUNT OF MITE-FREE LEAVES

1960 ◽  
Vol 38 (3) ◽  
pp. 645-653 ◽  
Author(s):  
D. P. Pielou
Keyword(s):  
Panonychus Ulmi ◽  
Total Count ◽  
Population Densities ◽  
Leaf Sample ◽  
Apple Trees ◽  
Assessment Of Performance ◽  
Narrow Zone ◽  
European Red Mite ◽  
Mite Density ◽  
The Mean

Examination of a large number of 100-leaf samples shows that the European red mite is distributed contagiously, not randomly, on leaves of apple trees. When the mean number of mites per leaf is plotted against the proportion of mite-free leaves for the corresponding sample, the points fall in a narrow zone, steepest and narrowest at the lower densities. Following application of miticides to heavily infested trees, it is usual to summarize the findings of the tests by grading the performance of the chemicals as excellent, good, etc. according to mite density as determined by s total count from the 100-leaf sample. A method is outlined, in which, by making use of plotted values, a count of mite-free leaves only is sufficient to allow the assessment of performance in such categories.

Green peach aphid and potato leafroll virus: transmission and control

2020 ◽  
Author(s):  
R.A. Bagrov ◽  
◽  
V.I. Leunov
Keyword(s):  
Myzus Persicae ◽  
Green Peach Aphid ◽  
Virus Transmission ◽  
Potato Leafroll Virus ◽  
Factors Affecting ◽  
Potato Viruses ◽  
Tuber Necrosis ◽  
Aphid Vectors ◽  
Leafroll Virus ◽  
And Control

The mechanisms of transmission of potato viruses from plants to aphid vectors and from aphids to uninfected plants are described, including the example of the green peach aphid (Myzus persicae, GPA). Factors affecting the spreading of tuber necrosis and its manifestation on plants infected with potato leafroll virus (PLRV) are discussed. Recommendations for PLRV and GPA control in the field are given.

scholarly journals Insecticidal activity of citronella grass essential oil on Frankliniella schultzei and Myzus persicae

2013 ◽  
Vol 37 (2) ◽  
pp. 138-144 ◽  
Author(s):  
Patrícia Fontes Pinheiro ◽  
Vagner Tebaldi de Queiroz ◽  
Vando Miossi Rondelli ◽  
Adilson Vidal Costa ◽  
Tiago de Paula Marcelino ◽  
...  
Keyword(s):  
Essential Oil ◽  
Insecticidal Activity ◽  
Myzus Persicae ◽  
Green Peach Aphid ◽  
Biological Activities ◽  
Chemical Constituents ◽  
Economic Losses ◽  
Frankliniella Schultzei ◽  
Wide Range ◽  
Citronella Grass

The thrips, Frankliniella schultzei, and green peach aphid, Myzus persicae, cause direct damage to plants of economic importance and transmit phytoviruses, causing large economic losses. Chemical constituents of essential oils present a wide range of biological activities. The aim of this work was to evaluate insecticidal activity of essential oil from citronella grass, Cymbopogon winterianus, on F. schultzei and M. persicae. This essential oil was obtained by steam distillation and components were identified by GC/FID and GC/MS. A Potter spray tower was used to spray insects with the essential oil. The major constituents are geraniol (28.62%), citronellal (23.62%) and citronellol (17.10%). Essential oil of C. winterianus at 1% (w v-1) causes mortality in F. schultzei and M. persicae at 34.3% and 96.9%, respectively. The LC50 value for M. persicae was 0.36% and LC90 0.66%. Thus, citronella grass essential oil at 1% (w v-1) is more toxic to M. persicae than F. schultzei. This essential oil shows promise for developing pesticides to manage M. persicae.

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