Important rice pest stem borers

The pest population density is controlled by logistic growth model. The logistic model is applied to find out the carrying capacity, equilibrium level and its solutions. In this model time varies continuously and the population is unstructured. The population members are of homogeneous group. By using the logistic growth model, the Equilibrium levels and maximum supportable population that is carrying capacity and the stability of equilibrium state of the important rice pest stem borers are calculated.

5p chauchaungayxua11 23-03-2021 9 2   Download

This survey was conducted in rice field during kharif season of year 2017 at Pusa farm of Rajendra Prasad Central Agricultural University, Pusa, Samastipur, Bihar. The important egg parasitoids of major insect pest of rice were observed for stem borer egg mass and leaf folder egg mass. The dominant egg parasitoid actively present throughout the kharif season on stem borer eggs was Trichogramma japonicum, it was found most active during the 33rd standard week of August 51.42% and least active in the 30th standard week of July 3.03%.

7p quenchua6 15-06-2020 4 2   Download

Rice Stem borer is an important rice pest in India. In the present study, the genetic variability was analyzed among geographically isolated populations of rice yellow stem borer (YSB) from sixty locations of Odisha using ISSR marker technique. Fifty ISSR primers were screened and eleven ISSR primers were selected on the basis of clarity, usability, and reproducibility of their banding patterns. The 11 primers produced a total of 67 bright and discernible bands, all of which were polymorphic.

9p nguathienthan4 18-04-2020 12 1   Download