Division of Crop Protection, ICAR-Indian Institute of Sugarcane Research, Lucknow226 002, Uttar Pradesh, India
*Email: arunbaitha@rediffmail.com (corresponding author)
Online Published on 04 January, 2024.
The distribution pattern of protective silken discs weaved by larvae of five broods (generations) of top shoot borer Scirpophaga excerptalis (Walker) was studied in three early maturing varieties (Co 0238, CoPk 09151 and CoLk 94184) and two mid late varieties (CoLk 13204 and CoLk 8102). The mean number of silken discs guarding the female pupa was more in first, second, third, fourth and fifth broods than male pupa in all varieties. The ranges of the discs protecting the female pupae in all broods (first, second, third, fourth and fifth) varied 3-12, 2-21, 2-17, 3-13 and 2-9, respectively. The male pupae were surrounded by 5.23 (CoLk 8102), 6.93, 8.73, 6.67 and 3.92 (CoPk 05191) discs, respectively which were higher than the other varieties in respective broods. The results allow us to better understand the distribution pattern of silken discs weaved by larvae of different broods of S. excerptalis in early and mid-late varieties.
Scirpophaga excerptalis, Crambidae, Lepidoptera, Pupal chamber, Exit hole, Parasitoids, Temperature, Humidity, Protective discs, Broods, Varietal differences, Dynamics
