author(s)
Muzamil Ali Jakhrani and Riffat Sultana

abstract
The present investigation is carried out to know the difference in two forms of H. oryzivorus which is the most dangerous pest of the paddy in Sindh. The study is carried during the month of the June 2016 to November 2017. Total of 1709 specimens were collected from Buxapur and Badani a major rice growing areas of Kashmore district. We have collected surprising amount of material both macropterous and brachypterous forms of H. oryzivorus from two importance varieties of rice i-e IRRI and Hybrid which are more preferable by this pest. The total body length was in the case of the Macropterous was calculated 32.66±4.5 mm in the male while in the female it was 48.43±3.59 mm, in the Brachypterous form it was 26.7±0.25 mm in the male while in female it was 39.8±4.90 mm. The major difference in the case of the tegmina in the both forms were also noted it was 22.1±5.21 mm in the male while it was 25.33±2.94 mm in the Macropterous form, the measurement in Brachypterous was 8.83±0.28 mm in male while 16.95±4.21 mm in the female respectively. The Multiple cultivation of Dhagha provides the ideal breeding place for enhancement of this pest population. Fair numbers of this species have been collected from this locality.