EFFECTS OF WATER AND HIGH HUMIDITY ON THE EUROPEAN RED MITE, PANONYCHUS ULMI (ACARINA: TETRANYCHIDAE)

1970 ◽  
Vol 102 (8) ◽  
pp. 955-961 ◽  
Author(s):  
Wm. L. Putman
Keyword(s):  
Relative Humidity ◽  
Leaf Surface ◽  
Panonychus Ulmi ◽  
High Humidity ◽  
European Red Mite

AbstractWater deposited on peach leaves as a constantly replenished film for 48 hr killed few European red mites, Panonychus ulmi (Koch), by drowning. Considerably more, especially of larvae, were lost by their coming loose from the water-covered leaf surface and floating off; the proportion thus lost did not differ greatly between 6- and 48-hr treatments. Relative humidity of 100% and to a lesser degree, 96–99%, inhibited activity and development.

SOME EFFECTS OF ANOXIA AND HYPOXIA ON THE EUROPEAN RED MITE, PANONYCHUS ULMI (ACARINA: TETRANYCHIDAE)

1968 ◽  
Vol 100 (6) ◽  
pp. 617-623 ◽  
Author(s):  
Wm. L. Putman
Keyword(s):  
Relative Humidity ◽  
Panonychus Ulmi ◽  
High Humidity ◽  
Immature Stages ◽  
Pure Nitrogen ◽  
Adult Females ◽  
European Red Mite ◽  
Partial Paralysis

AbstractProgressively increasing lengths of exposure to pure nitrogen caused temporary anaesthesia, irreversible partial paralysis, and death, in that order, to the European red mite, Panonychus ulmi (Koch). The immature stages, especially eggs, were more tolerant than adult females. Confinement in 2.5% oxygen at a relative humidity approximating 100% had no effect on the mites, except on oviposition, beyond that of high humidity alone.

EFFECTS OF HUMIDITY AND PHOSPHORUS ON POPULATIONS OF THE EUROPEAN RED MITE PANONYCHUS ULMI (ACARI: TETRANYCHIDAE)1

1989 ◽  
Vol 24 (3) ◽  
pp. 298-308
Author(s):  
Merle Dormond ◽  
Preston E. Hunter
Keyword(s):  
Relative Humidity ◽  
Host Plant ◽  
Laboratory Study ◽  
Panonychus Ulmi ◽  
Day Length ◽  
Combined Effects ◽  
Hoagland Solution ◽  
European Red Mite ◽  
Two Temperatures

A laboratory study investigating the combined effects of phosphorus and relative humidity upon reproduction by the European red mite Panonychus ulmi (Koch) was conducted. Phosphorus effects were tested at two levels (Hoagland solution with or without phosphorus) and relative humidity at five levels (6%, 30%, 60%, 75% and 90%). Experiments were run at two temperatures, 21°C and 25°C, and at a day-length regime of 16L:8D. The mites' response to phosphorus was characterized by a significant increase in progeny numbers when the host plant contained “high” levels of this element. Reaction to humidity was characterized by an increase in progeny at relative humidities between 60% and 75%. Under the same RH conditions, higher numbers of progeny were generally obtained from plants containing higher levels of phosphorus; the most favorable treatment was Hoagland solution with phosphorus and 75% RH.

scholarly journals Pathogenicity of Isaria fumosorosea to European red mite in the laboratory

Biotemas ◽  
2017 ◽  
Vol 30 (1) ◽  
pp. 73
Author(s):  
Cláudia Andréia Gräff ◽  
Liana Johann ◽  
Cláucia Fernanda Volken de Souza ◽  
Noeli Juarez Ferla
Keyword(s):  
Rio Grande ◽  
Panonychus Ulmi ◽  
Rio Grande Do Sul ◽  
Isaria Fumosorosea ◽  
European Red Mite

http://dx.doi.org/10.5007/2175-7925.2017v30n1p73A vitivinicultura no estado do Rio Grande do Sul tem sofrido infestações significativas de ácaros praga, destacando-se recentemente Panonychus ulmi (Koch). Há relatos sobre a capacidade de controle de ácaros fitófagos com Isaria fumosorosea. O objetivo deste trabalho foi avaliar em laboratório a ação patogênica de I. fumosorosea sobre o ácaro P. ulmi. As criações de P. ulmi foram estabelecidas a partir de coleta realizadas em videiras da Serra Gaúcha. Sobre os ovos de P. ulmi, as aplicações de suspensões de esporos foram feitas em diferentes concentrações. As triplicatas das fêmeas de 12 a 15 dias foram tratadas com suspensão a 108 esporos x mL-1. As testemunhas foram tratadas com água destilada. Após sete dias da aplicação, observaram-se 55,6% de ovos não eclodidos tratados com suspensão 106 esporos x mL-1 e com fêmeas tratadas obteve-se uma mortalidade total entre 85-90% e mortalidade confirmada entre 50-55%. A mortalidade máxima dos controles no tratamento dos ovos e das fêmeas foi, em média, de 12,8 e 15,5%, respectivamente. Conclui-se que o isolado I. fumosorosea possui habilidade para infectar ovos e fêmeas adultas de P. ulmi e portanto mostra-se como uma alternativa viável para ser experimentada no campo.

Polybutenes in Orchard Pest Control

1962 ◽  
Vol 94 (11) ◽  
pp. 1222-1227 ◽  
Author(s):  
R. S. Downing
Keyword(s):  
British Columbia ◽  
Pest Control ◽  
Spider Mite ◽  
Panonychus Ulmi ◽  
Phytophagous Mites ◽  
European Red Mite ◽  
Short Time ◽  
Methods Of Control

In British Columbia the control of phytophagous mites, especially the European red mite, Panonychus ulmi (Koch), and the McDaniel spider mite, Tetranychus mcdanieli McG., is becoming increasingly difficult, mainly because of the mites' ability to develop resistance to most acaricides in a relatively short time (3). Because of this, methods of control other than strictly chemical are examined at every opportunity.

STUDIES OF THE AGING OF CONIDIA OF MONILINIA FRUCTICOLA (WINT.) HONEY: I.GERMINATION RATES AND LONGEVITY

1957 ◽  
Vol 35 (5) ◽  
pp. 635-645 ◽  
Author(s):  
S. H. Z. Naqvi ◽  
H. M. Good
Keyword(s):  
Relative Humidity ◽  
Storage Temperature ◽  
Potato Dextrose Agar ◽  
Monilinia Fructicola ◽  
High Humidity ◽  
Percentage Germination ◽  
Low Humidity ◽  
Nutrient Solutions

Conidia of Monilinia fructicola (Wint.) Honey were stored 1–10 months at temperatures of 5°, 25°, and 35 °C. and at constant relative humidities approximating 0, 15, 45, 75, and 90%. The germination of these spores was tested on potato dextrose agar containing 6% glucose, and curves of the percentage germination against time are given for representative samples.A pronounced delay in germination developed under all conditions of storage. The rate at which this delay developed was virtually independent of the storage temperature. All spore samples gave 100% germination after 3 months but only those at 5 °C. gave; any germination after 10 months. Storage in a relative humidity of 75% gave the best preservation of spore vigor, there being evidence in other conditions of either high humidity or low humidity injury. Of the nutrient solutions tested, glucose was the only one which gave substantially better germination than water, the effect being most marked on spores stored for some months at high humidity. With glucose, such spores sometimes germinated faster than those stored at intermediate humidities.

Episodic basin-scale soil moisture anomalies associated with high relative humidity events in the McMurdo Dry Valleys, Antarctica

2021 ◽  
pp. 1-15
Author(s):  
Joseph Levy
Keyword(s):  
Soil Moisture ◽  
Relative Humidity ◽  
Mcmurdo Dry Valleys ◽  
Limiting Factor ◽  
High Humidity ◽  
Dry Valleys ◽  
Surface Soils ◽  
Basin Scale ◽  
Soil Reflectance

Abstract Outside of hydrologically wetted active layer soils and humidity-sensitive soil brines, low soil moisture is a limiting factor controlling biogeochemical processes in the McMurdo Dry Valleys. But anecdotal field observations suggest that episodic wetting and darkening of surface soils in the absence of snowmelt occurs during high humidity conditions. Here, I analyse long-term meteorological station data to determine whether soil-darkening episodes are present in the instrumental record and whether they are, in fact, correlated with relative humidity. A strong linear correlation is found between relative humidity and soil reflectance at the Lake Bonney long-term autonomous weather station. Soil reflectance is found to decrease annually by a median of 27.7% in response to high humidity conditions. This magnitude of darkening is consistent with soil moisture rising from typical background values of < 0.5 wt.% to 2–3 wt.%, suggesting that regional atmospheric processes may result in widespread soil moisture generation in otherwise dry surface soils. Temperature and relative humidity conditions under which darkening is observed occur for hundreds of hours per year, but are dominated by episodes occurring between midnight and 07h00 local time, suggesting that wetting events may be common, but are not widely observed during typical diel science operations.

EFFECTS OF SEVIN ON PHYTOPHAGOUS MITES AND PREDATORS IN AN ONTARIO PEACH ORCHARD

1960 ◽  
Vol 40 (1) ◽  
pp. 198-201 ◽  
Author(s):  
Wm. L. Putman ◽  
D. C. Herne
Keyword(s):  
Panonychus Ulmi ◽  
Predacious Mite ◽  
Phytophagous Mites ◽  
European Red Mite ◽  
Peach Trees ◽  
Peach Orchard ◽  
Stethorus Punctillum

Numbers of the European red mite (Panonychus ulmi Koch) increased but those of the brown mite (Bryobia arborea Morgan & Anderson) and the peach silver mite (Vasates cornutus Banks) decreased after sprays of Sevin (N-methyl-1-naphthyl carbamate) were applied to peach trees. Sevin practically eliminated the predacious mite Typhlodromus rhenanus Oudms., and larvae and pupae of Stethorus punctillum Weise, and greatly reduced the numbers of adults of S. punctillum, chrysopid larvae, and spiders.

scholarly journals Characterization of abamectin resistance in Iranian populations of European red mite, Panonychus ulmi Koch (Acari: Tetranychidae)

2019 ◽  
Vol 125 ◽  
pp. 104903 ◽  
Author(s):  
Fariborz Rameshgar ◽  
Jahangir Khajehali ◽  
Ralf Nauen ◽  
Wannes Dermauw ◽  
Thomas Van Leeuwen
Keyword(s):  
Panonychus Ulmi ◽  
European Red Mite ◽  
Iranian Populations
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