DAMAGE ASSESSMENT IN SOME VEGETABLE CROPS INFESTED BY THE TWO-SPOTTED SPIDER MITE, TETRANYCHUS URTICA

HEBA MOHAMED IMAM MOHAMED,

Abstract


The two-spotted spider mite (TSSM), T. urticae is a cosmopolitan and extremely polyphagous species with great economic importance for crops in greenhouses and open fields. It has a wide range of hosts especially vegetable crops. This mite pest has a great effect on the plant growth and its chemical and anatomical structure which resulted in an intensive reduction in the total yield, so the present study was conducted to figure out the injury effect of T. urticae on cucumber, Cucumuis sativus L. (Hail, var.) , tomato Lycopersicon esculentum M. (Super-Strain b, var.) and sweet pepper plants, Capsicum annum L. (Top-Star, var.). Three levels of T. urticae infestation (2, 6, 12♀ / plant) were used to study their effects on the plant growth, yield and chemical contents on the previous plants under greenhouse conditions. Mite density counted through the period of infestation. Injury effect of T. urticae on the anatomical and histological changes only studied in the cucumber leaves. The obtained results in the present study could be summarized as following:

A:- Determination of the plant growth and yield losses of three vegetable crops, cucumber, tomato and sweet pepper as affected by the infestation with T. urticae.

A1:- Determination of the plant growth and yield losses of cucumber C. sativus (Hail var.) as affected by the infestation with T. urticae.
A1.1-Plant growth:
• The lowest leaf area, plant height and number of leaves were (53.68 cm.2, 53.77cm. and 10.4) comparing with the control (82.66 cm.2, 58.67cm. and 12.5), respectively, at the high infestation level (12♀ /plant).

• The reduction of fresh weight of leaves were (26.53, 37.39 and 50.32%), whereas moisture content were (9.03, 19.22 and 35.77%) at the three levels of mite infestation (2, 6, 12♀ /plant), respectively.

A1.2- Flowering and yield:
• The lowest number and weight of fruits were recorded at the high level of infestation 12♀ /plant (1.73/plant and 81.78 (g)/plant) with a reduction of (30.35 and 37.09 %), respectively.

• No significant differences in the flower numbers at all infestation


Other data

Title DAMAGE ASSESSMENT IN SOME VEGETABLE CROPS INFESTED BY THE TWO-SPOTTED SPIDER MITE, TETRANYCHUS URTICA
Other Titles تقدير الأضرار في بعض محاصيل الخضرالمصابة بأكاروس العنكبوت ذو البقعتين
Authors HEBA MOHAMED IMAM MOHAMED
Issue Date 2014
URI http://research.asu.edu.eg/handle/12345678/38022

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