Bio-ecology of sorghum shoot fly, Atherigona soccata and stem borer Chilo partellus
Abdisalam Ali Nur Abdi
Shoot fly and Stem borer are the key pests in most of sorghum growing area. In India nearly 150 insect species have been reported as pests on sorghum (Jotwani et al., 1980, Sharma, 1993), of which sorghum shoot fly (Atherigona soccata), and stem borers (Chilo partellus,). Are important pests. The shootfly is serious particularly in late sown crop. Stem borer, Chilo partellus Swinhoe is regularly causing economic losses during kharif and Rabi seasons. Looking the seriousness of these pests an attempt was made to gather information on seasonal incidence. An experiment was conducted in the farmer’s field during the Rabi and Kharif seasons 2016. In both the season once in a week time the population of Shootflies and Stem borers were recorded by identifying the symptoms such as dead heart. From the data it is evident that during September and October when the maximum temperature was between 28-30oC the infestation was very high and causing 38% dead heart in sorghum. Further, Study on population dynamics of shoot fly revealed that the infestation of shoot fly on sorghum commenced in 1st week after germination. The pest infestation increased fast during second week and moved to the peak, However, the damage decreased from 3rd week after germination of the crop. In our study area Maize, Finger millet, several species of grasses are considered as alternate hosts. The population of C. Partellus is high during November and December. Regarding Kharif season Shootfly attack was lower when compared to stem borer attack.