A STRAIN OF TETRANYCHUS URTICAE FROM THE GROUND COVER OF AN APPLE ORCHARD RESISTANT TO CHLORFENSON

1965 ◽  
Vol 45 (3) ◽  
pp. 226-228
Author(s):  
W. H. Foott
Keyword(s):  
Tetranychus Urticae ◽  
Ground Cover ◽  
Apple Orchard ◽  
Panonychus Ulmi ◽  
Spray Drift ◽  
Apple Trees ◽  
Low Level ◽  
Tetranychus Urticae Koch

A strain of Tetranychus urticae Koch (Acarina:Tetranychidae) developed a low level of resistance to chlorfenson when the material drifted to the ground cover while apple trees were sprayed for control of Panonychus ulmi (Koch). After being reared in the greenhouse for 4 years without further exposure to chlorfenson T. urticae lost its resistance. When Kelthane was substituted for chlorfenson as a control for P. ulmi the spray drift that reached the ground cover virtually eliminated T. urticae from the orchard.

THE EGGS AND OVIPOSITION SITES OF DIAPHNIDIA CAPITATA (HEMIPTERA: MIRIDAE) ON APPLE TREES

1970 ◽  
Vol 102 (10) ◽  
pp. 1316-1319 ◽  
Author(s):  
R. L. Horsburgh ◽  
Dean Asquith
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mites ◽  
Panonychus Ulmi ◽  
Apple Trees ◽  
Oviposition Sites

AbstractNymphal and adult Diaphnidia capitata (Van Duzee) have long been recognized as predators of Panonychus ulmi (Koch) and Tetranychus urticae Koch. The eggs and oviposition sites preferred by this species are described herein to supplement available descriptions of the eggs of mirid predators of spider mites.

scholarly journals The influence of the two-spotted spider mite (Tetranychus urticae Koch.) and irrigation on yield of 5-years-old apple trees

2013 ◽  
Vol 55 (2) ◽  
pp. 113-119
Author(s):  
Wojciech Warabieda ◽  
Remigiusz W. Olszak
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Fruit Weight ◽  
Economic Injury Level ◽  
Apple Trees ◽  
Economic Injury ◽  
Apple Cultivars ◽  
Effect On Yield ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch

The influence of the two-spotted spider mite (<i>Tetranychus urticae</i>) on yield of apple trees was investigated. The experiment was conducted on rrigated and non-irrigated 5-years-old apple trees of 'Close' and 'Jonagold' cultivars grafted on M.9. The population size of the pest exceeded four and two times the valid (in Poland) economic injury level on trees of 'Close' and 'Jonagold' cultivars respectively. No significant influence of mites on yield and its quality (mean fruit weight and fruit colour) was observed on both apple cultivars. Irrigation had positive effect on yield and quality of 'Jonagold'. On the contrary, trees of ' Close' cultivar were positively influenced by irrigation only regarding fruits colour. Results of the study support opinion that the economic injury level for apple orchards, with respect to two-spotted spider mite, should be higher than it is up to now.

scholarly journals Localização de presas à curta distância por Neoseiulus californicus (McGregor) (Acari: Phytoseiidae): o papel dos aleloquímicos dos ácaros fitófagos Panonychus ulmi (Koch) e Tetranychus urticae Koch (Acari: Tetranychidae) e da planta hospedeira, Malus domestica (Borkham)

2000 ◽  
Vol 29 (4) ◽  
pp. 705-713 ◽  
Author(s):  
Karin F.S. Collier ◽  
Álvaro E. Eiras ◽  
Gilberto S. Albuquerque ◽  
Jacquelyn L. Blackmer ◽  
Marilaine C. Araújo ◽  
...  
Keyword(s):  
Tetranychus Urticae ◽  
Malus Domestica ◽  
Panonychus Ulmi ◽  
Neoseiulus Californicus ◽  
Tetranychus Urticae Koch

Para conhecer os estímulos olfativos à curta distância que Neoseiulus californicus (McGregor) usa para encontrar seu alimento, isto é, os ácaros fitófagos Panonychus ulmi (Koch) e Tetranychus urticae Koch, estudaram-se as respostas deste ácaro predador em relação aos aleloquímicos voláteis oriundos tanto das duas espécies de presa como de sua planta hospedeira, Malus domestica (Borkham). Na extremidade de um braço da trilha em Y foi introduzido um disco de folha sadia de macieira (= controle) e na outra um dos oito tipos de estímulo (= tratamento) seguintes: 1) folha sadia, 2) folha sadia com a presa, 3) folha sadia com cairomônios da presa, 4) folha sadia com a presa e seus cairomônios, 5) folha atacada limpa, 6) folha atacada com a presa, 7) folha atacada com cairomônios da presa e 8) folha atacada com a presa e seus cairomônios. Para cada tratamento, observou-se a direção do deslocamento do ácaro predador e analisou-se sua porcentagem de resposta. Para localizar P. ulmi, N. californicus orientou-se pelos estímulos oriundos de folhas sadias com a presa e seus cairomônios (T4), folhas atacadas com cairomônios da presa (T7) e folhas atacadas com a presa e seus cairomônios (T8). Com relação a T. urticae, o ácaro predador respondeu significativamente aos estímulos oriundos de folhas sadias com cairomônios da presa (T3) e de folhas sadias com a presa e seus cairomônios (T4), assim como de todas as combinações com folhas atacadas (T5-8). Estes resultados demonstram que os voláteis emanados pelos ácaros fitófagos, por seus subprodutos e pela planta por eles atacada, em conjunto ou isoladamente, são importantes fontes de informação para N. californicus localizar T. urticae à curta distância. Por outro lado, somente a combinação de dois ou mais estímulos olfativos parece sinalizar a localização de P. ulmi para o ácaro predador, principalmente se os cairomônios de suas fezes, ovos e exúvias estiveram incluídos em tal mistura.

Competition between Two Species of Mites. I. Experimental Results

1962 ◽  
Vol 94 (4) ◽  
pp. 365-375 ◽  
Author(s):  
W. H. Foott
Keyword(s):  
Ground Cover ◽  
Early Summer ◽  
Apple Orchard ◽  
Panonychus Ulmi ◽  
Residual Effects ◽  
Research Station ◽  
Large Numbers ◽  
Mite Control ◽  
Two Spotted Spider Mite ◽  
Peach Trees

Two principal pests of apple and peach trees in southwestern Ontario are the European red mite, Panonychus ulmi (Koch), and the two-spotted spider mite, Tetranychus telarius (L.). Usually only P. ulmi is present on the trees in large numbers during the spring and early summer, at which time T. telarius lives predominantly on the ground cover. In August, many T. telarius move from the ground cover to the trees, and large numbers of both species may then be present. In mite control investigations in an apple orchard at the Harrow Research Station, T. telarius moved onto the trees, especially in the central plots, regardless of the acaricides previously applied or the numbers of P. ulmi that were or had been present. This phenomenon posed the question of whether the residual effects of acaricides applied to the trees were mainly responsible for the size of P. ulmi populations in the central plots, or whether competition resulting from the ingress of T. telarius was partially responsible.

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