Preference of Cotton Jassid, Amrasca Devastans, Towards Different Okra Cultivars Having Variable Physio-morphic Characteristics
Preference of Cotton Jassid, Amrasca Devastans, Towards Different Okra Cultivars Having Variable Physio-morphic Characteristics
Naima Din1, Misbah Ashraf1, Muhammad Rizwan2*, Muhammad Babar Shahzad Afzal4, Hafiz Ghazanfar Abbas2, Farrukh Ilahi2, Amir Hameed5, Muhammad Ahsin Ayub6, Qurban Ali1 and Muhammad Farooq2,3
ABSTRACT
Five cultivars of Okra viz., Sabz Pari, Shakti Hybrid, NS-810, OK Advanta-803 and NS-801 were tested for resistance against Amrasca devastans (Dist.) at the farm area of Vegetable Research Institute, Ayub Agricultural Research Institute (AARI), Faisalabad in 2018-19. Observations regarding the population of A. devastans were recorded from 20 leaves per treatment at random (upper, lower, middle leaves), Physio-morphic characters viz., plant height, number of branches, area of leaf lamina, hair density on midrib, chlorophyll contents and moisture percentage were also evaluated for the tested varieties. Among the tested varieties, OK Advanta-803 was most resistant to the jassid (13.36/leaf), whereas NS-810 was most susceptible to the A. devastans (23.93/leaf). A. devastans population showed a significant and positive correlation (r = 0.8573*) with area of leaf lamina and moisture percentage (r = +0.7192*). As leaf area of NS-810 (184.34 cm2) was larger; therefore, this variety showed maximum susceptibility to A. devastans while OK Advanta-803 showed minimum A. devastans population per leaf due to its smaller leaf area (91.04 cm2) compared to other varieties. Similarly, A. devastans population was maximum in NS-810 due to its higher moisture contents (66.07%), while it was minimum in OK Advanta-803 due to lesser moisture contents (52.17 %) in this variety. However, all other physio-morphic characters viz., plant height, number of branches, hair density on midrib, and chlorophyll contents showed a non-significant correlation with A. devastans population.
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