درست المؤشرات الحيوية و الحياتية للأكاروس الأحمر ذي البقعتين Tetranychus urticae (Koch) عند حرارة 1±25 Cº ، و رطوبة 5±65%، و 8:16 ساعة إضاءة/ظلام، و على أوراق صنفين من التفاح ( غولدن, ستاركنغ ديليشز ). كان معدل الزيادة الفعلية rm لإناث T.urticae على أوراق الصنف ستاركنغ أعلى مقارنة مع الصنف غولدن (0.30 و 0.27 أنثى/أنثى/يوماً على التوالي), في حين كانت مدة زمن الجيل (T)، و المدة اللازمة لتضاعف أعداد مجتمع الأكاروس (DT) على الصنف ستاركنغ أقل منه على الصنف غولدن (13.77, 2.3 و 14.54, 2.55 يوماً على التوالي)، استغرق التطور من البيضة إلى الأنثى البالغة على الصنف غولدن مدة زمنية أطول بالمقارنة مع الصنف ستاركنغ, (13.32 ±1.15 و 12.22±1.13 يوم على التوالي).
كان معدل الخصوبة الكلية، و طول عمر البالغة على الصنف غولدن أقل منه على الصنف ستاركنغ (83.11±8.91 ، و 101.62±15.48 بيضة/أنثى على التوالي)، و (15.33 ±1.35 و 17.14±1.07 يوماً على التوالي). يمكن أن تعزى هذه الاختلافات على صنفي التفاح إلى المحتوى الكيميائي، و نوعية الغذاء، و طبيعة النسيج الورقي للعائل النباتي، و هذه المواصفات يمكن أن تؤثر في معدل وضع البيض و التطور، و من ثَمّ كان الصنف ستاركنغ أكثر ملائمة لتطور الأكاروس الأحمر ذي البقعتين و تكاثره، مقارنة مع الصنف غولدن.
Biological characteristics and life table parameters of the two-spotted spider mite Tetranychus urticae (Koch) were studied when fed on leaves of two apple cultivars (i.e. Golden and Starking dilishz) under laboratory conditions 25±1 Cº, relative humidity 65±5% and 16L:8D. The intrinsic rate of increase (rm) by females of T.urticae was higher on leaves of Starking dilishz apple cultivar than on leaves of Golden dilishz apple cultivar (0.30, 0.27 female/female/day) respectively, while the generation time (T) and the time required for doubling the number of community mite (DT) were lower on leaves of Starking dilishz apple cultivars than on leaves of Golden dilishz apple cultivars (13.77, 2.3 days and 14.54, 2.55 days) respectively. The duration of the stages of growth from egg to adult female on leaves of Golden dilishz apple cultivar was longer than on Starking dilishz apple cultivars, where was (13.32 ± 1.15 and 12.22 ± 1.13), respectively, The Total fecundity on Golden dilishz apple cultivar was lower than on Starking dilishz cultivar (83.11 ± 8.91, 101.62 ± 15.48 eggs/female) respectively, The adult longevity on Golden dilishz leaves was lower than on Starking dilishz cultivar (15.33 ± 1.35, 17.14 ± 1.07 days) respectively, These differences on the apple varieties may be due to the chemical content and quality of the food and nature of the host tissue plant and the specifications can affect the rate of oviposition and development. and thus the Starking dilishz apple cultivars was more suitable for the development and reproduction of T. urticae compared with the Golden dilishz apple cultivar.
References used
ABD EL-WAHED,N.M. and EL-HALAWANY,A.S. Effect of Temperature Degrees on the Biology and Life Table Parameters of Tetranychus urticae Koch on Two Pear varieties. Egypt. Acad. J. Biolog. Sci.,2012, 4(1): 103-109
BENGSTON,M. Effect of different varieties of the apple host on the development of Tetranychus urticae (Koch). Qld. J. Agric. Anita. Sci. 27:95-114
CAREY,J.R. and BRADLEY,J.W. Developmental rates, vital schedules, sex ratios and life tables for Tetranychus urticae, T. turkestani and T. pacificus (Acarina: Tetranychidae) on cotton. Acarologia,1982, 22:89-111
The accuracy of the taxon T. cinnabarinus (Boisduval 1867) as a distinct species, or
as a synonym of Tetranychus urticae Koch 1836, is still standing as a controversial issue of
taxonomy and as a point of discussion. T. cinnabarinus and T. urticae
In this experiment, liquid of soap at three dosages (3, 5 and 7 ml/L) and
Abamectin (12.5 ml/100L) has been used with releas of the mite predator,
Phytoseiulus persimilis for controlling the two-spotted spider mite, Tetranychus
urticae on bean pla
This study was conducted in order to evaluate the efficacy of the aqueous extracts
of three plants (Melia azedarach L., Smilax asepra L. and Styrax officinalis L.),
three pesticides (acetamiprid, abamectin and pyridaben) and releasing of two
preda
This study was carried out in AL Swaida nursery during 2009 and 2010
seasons to study effect of time and grafting high are on the growth strength of
apple cultivars: Golden delicious، Stark rimson, Starking delicious. Results
showed that Golden de
The aim of the research was to study seasonal changes communities of spider mites
and predatory mite Typhlodromus athiasae Porath and Swirski on two apple cultivars
(Golden and red Delicious) from orchards located in two regions: Al-Mokharam and Al