Screening of okra genotypes (Abelmoschus esculentus L.) against jassid (Amrasca biguttula biguttula Ishida) under agro-climatic conditions of Bahawalpur, Pakistan

摘要

Okra (Abelmoschus esculentus L.) is one of the important vegetable crops grown all over the world from tropical to sub-tropical areas. It can be grown throughout the year. It is also grown in Pakistan. There are many diseases and a number of insects which cause severe damage to okra and among these, jassid (Amrasca biguttula biguttula Ishida) is an important sucking pest, which causes damage by sucking the cell sap. Thus, current study was conducted regarding varietal screening of okra genotypes against jassid. Five different varieties, i.e., Green wonder, Local cultivar, Pusa swani, Sabz pari and Sharmeeli were sown and investigated for jassid infestation. All genotypes were non-significantly different from each other regarding jassid population. Results showed maximum jassid population on Pusa swani (6.256 ± 1.978 per leaf) and minimum was on Green wonder (4.937 ± 1.561 per leaf). Jassid population significantly varied on okra genotypes with respect to different dates of observation, i.e. maximum jassid population was recorded on 29th of June and minimum was on 11th of May. Host Plant Susceptibility Indices (HPSIs) for okra genotypes showed that Pusa swani had maximum value (23%) and minimum on Green wonder (17%). Subsequently yield was maximum in Green wonder variety and minimum in Pusa swani and Sabz pari. Correlation of environmental factors (average temperature and relative humidity) showed temperature had negative and humidity had a positive correlation with jassid population. This study will be helpful for managing the A. biguttula on okra under agro climatic conditions like in Bahawalpur.