Effect of Age on Reproductive Behaviour of the Brown Planthopper, Nilaparvata lugens Stál (Hemiptera: Delphacidea)
Effect of Age on Reproductive Behaviour of the Brown Planthopper, Nilaparvata lugens Stál (Hemiptera: Delphacidea)
Agha Mushtaque Ahmed*1, Ali Zachi Abdulqader Alhilfi2, Fahad Nazir Khoso1, Imran Khatri1, Jamal-U-Ddin Hajano3, Qurban Ali4, Imran Ali Rajput5 and Muhammad Akbar Lashari1
ABSTRACT
The insect age plays a significant role in the intensity of competitive behaviours among the individuals. The courtship behaviour of brown planthopper (BPH) is followed by numbers of strides by both genders and influenced with age. In the present study, the age of male for 1-7 days and female 1-10 days was selected to observe the different parameters {male response time (MRT), male arrival time (MAT), male arresting time (MATt), number of times male extended genitalia (MEG), total pre-mating time (TPMT), mating duration (MD), female calling latency and female rejecting rate}. In the results, a maximum MRT 13.14±1.77 min was observed in D1. The BPH males approached to the female with jerky walking steps up and down with a minimum time of 0.24 ±0.03 min in D3. After successful male arrival, male went for a maximum arresting time of 3.19±0.51 min by female in D1. Though, all the males extended their genitalia for successful copulation but D1 male did not only take maximum time under female arresting but it also extended genitalia with maximum number of 5.80±0.37 times. Overall, a maximum pre-mating time of 16.70 ± 0.55 min and minimum 3.39 ± 0.17 were observed in D1 and D5 males. The mating duration was lower in early ages (D1 and D2) and became advanced / peaked in mid ages (D5 and D6) which later decreased again in D7. The physical behaviour of BPH females did not show any mating response during the first and second day of emerging. However, the lowest calling latency was observed in D9 (2.2 ± 0.3) and D10 (2.2 ± 0.3) and maximum in D3 (12.1 ± 1.5). The correlation coefficient also indicated strong with negative relationship (r= -0.92) between male age and total premating time and strong with positive relationship (r=0.95) between male age and mating percentage.
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