scholarly journals Effect of weather on the abundance of winter eggs of the European red spider mite on apple

1992 ◽  
Vol 1 (1) ◽  
pp. 83-93
Author(s):  
Tuomo Tuovinen
Keyword(s):  
Spider Mite ◽  
Growing Season ◽  
Early Spring ◽  
Panonychus Ulmi ◽  
Hatching Rate ◽  
Egg Hatching ◽  
Growing Period ◽  
Growing Seasons ◽  
Temperature And Precipitation ◽  
Red Spider Mite

Winter eggs of the European red spider mite Panonychus ulmi were counted on apple twig samples (N = 279) collected in south-western Finland in the winters of 1984/85 through 1989/90. The results of the counts were analyzed to determine the effect of the regional temperature and precipitation during the preceding growing season on the abundance of overwintering spider mite eggs. The total effective temperature sum of the growing seasons in day-degrees over + 5 °C varied between 1030 and 1564 and the total precipitation between 289 and 562 mm in May - October. The number of P. ulmi winter eggs in commercial orchards correlated positively with the sum of day-degrees in August, July, June and during the entire growing period. There were negative correlations between the numbers of P. ulmi winter eggs and the precipitation in May, October, August and in the entire growing season. The cold winters of 1985 (min. temp. - 36.7 °C) and 1987 (- 34.0 °C) reduced the percentage of winter egg hatching to 23 and 56.5 %, respectively, compared to the mean hatching rate of 75-77 % in 1986 and 1988. The value of weather records to facilitate the prognosis of need of early spring sprays against P. ulmi is discussed.

Panonychus ulmi. [Distribution map].

1972 ◽  
Author(s):  
Keyword(s):  
Host Plants ◽  
Spider Mite ◽  
Pacific Islands ◽  
Panonychus Ulmi ◽  
Forest Trees ◽  
Distribution Map ◽  
Red Spider Mite ◽  
Deciduous Fruit ◽  
New Distribution ◽  
Distribution In Europe

Abstract A new distribution map is provided for Panonychus ulmi (Koch) (Metatetranychus pilosus[Panonychus ulmi] (C. & F.)) (Acarina, Tetranychidae) (European or Fruit Tree Red Spider Mite). Host Plants: Deciduous fruit and forest trees. Information is given on the geographical distribution in EUROPE (excl. USSR), Austria, Belgium, Britain, Bulgaria, Czechoslovakia, Denmark, Finland, France, Germany, Western, Greece, Hungary, Ireland, Northern, Italy, Netherlands, Norway, Poland, Portugal, Rumania, Sicily, Spain, Sweden, Switzerland, Yugoslavia, ASIA (excl. USSR), Iran, Israel, Japan, Lebanon, Syria, Turkey, USSR, AFRICA, Algeria, Egypt, Libya, South Africa, Tunisia, AUSTRALASIA and PACIFIC ISLANDS, Australia, New Zealand, NORTH AMERICA, Canada, U.S.A., WEST INDIES, SOUTH AMERICA, Argentina, Chile, Venezuela.

Hatching of the winter eggs of the fruit-tree red spider mite (Panonychus ulmi (Koch))

1968 ◽  
Vol 62 (2) ◽  
pp. 227-239 ◽  
Author(s):  
W. I. ST G. LIGHT ◽  
MARGARET E. JOHN ◽  
H. J. GOULD ◽  
K. J. COGHILL
Keyword(s):  
Spider Mite ◽  
Fruit Tree ◽  
Panonychus Ulmi ◽  
Red Spider Mite

scholarly journals Bioacaricidal Potential of Moringa oleifera Ethanol Extract for Tetranychus merganser Boudreaux (Acari: Tetranychidae) Control

Plants ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1034
Author(s):  
Rapucel Tonantzin Quetzalli Heinz-Castro ◽  
Roberto Arredondo-Valdés ◽  
Salvador Ordaz-Silva ◽  
Heriberto Méndez-Cortés ◽  
Agustín Hernández-Juárez ◽  
...  
Keyword(s):  
Moringa Oleifera ◽  
Spider Mite ◽  
Ethanolic Extract ◽  
Spider Mites ◽  
Control Measures ◽  
Control Treatment ◽  
Severe Damage ◽  
Egg Hatching ◽  
Red Spider Mite ◽  
Red Spider Mites

The Tetranychidae family includes mites causing severe damage to agricultural fields. The red spider mite, Tetranychus merganser Boudreaux (Acari: Tetranychidae), causes severe damage to several plant species grown as cash crops. Current red spider mite control depends mainly on chemical insecticides. There is a need for alternate control measures that are environmentally friendlier than chemical pesticides. The aim of the study was to assess the effects of Moringa oleifera leaf ethanolic extract at different concentrations (0.1, 0.5, 1, 5, 10, 15, and 20% (v/v)) against T. merganser females. Such effects can serve as a basis to include this compound in integrated pest management programs for the control of red spider mites. Mites treated with 20% (v/v) killed 86.67%, 13.70%, and 96.30% at 24, 48, and 72 h, respectively, as compared to the control treatment. Oviposition, egg hatching, and the damage caused by red spider mites were all reduced at high concentrations. Moringa oleifera leaf ethanolic extract can be used as a powerful bioacaricide for the control of T. merganser.

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