<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>This paper deals with the studies on the biology and development of the bark beetle <italic>Ips stebbingi</italic> Strohmeyer, 1908 (Coleoptera: Curculionidae: Scolytinae), a pest of Himalayan blue pine <italic>Pinus wallichiana</italic> A.B.Jacks. in Kashmir Himalaya. This pest is an aggressive and notorious one, but little is known of its biology. This beetle pest overwinters in adult stage under the bark of host trees <italic>P. wallichiana</italic>. After emergence, the adults fly to suitable trees and undergo maturation feeding for 4–6 days. Reproduction is polygamous type; two to six females join a male in his nuptial chamber. After mating, each of the females makes one gallery with an average length of 10.76 (±3.30 standard deviation [SD]) cm. The female lays 23.16 (±7.03 SD) eggs on an average. The eggs hatch in 8–18 days. The larvae have five instars and complete their development in 30–45 days constructing larval galleries of 3.83 (±0.63 SD) cm in length. The larvae pupate for 18–28 days and finally the adults emerge to attack new suitable trees. The adults live for 45–70 days, and the total lifespan of this species ranges from 101 to 156 days. The seasonal distribution of various life stages and the number of generations were also recorded.</p>
</abstract>

This paper deals with the studies on the biology and development of the bark beetle Ips stebbingi Strohmeyer, 1908 (Coleoptera: Curculionidae: Scolytinae), a pest of Himalayan blue pine Pinus wallichiana A.B.Jacks. in Kashmir Himalaya. This pest is an aggressive and notorious one, but little is known of its biology. This beetle pest overwinters in adult stage under the bark of host trees P. wallichiana. After emergence, the adults fly to suitable trees and undergo maturation feeding for 4–6 days. Reproduction is polygamous type; two to six females join a male in his nuptial chamber. After mating, each of the females makes one gallery with an average length of 10.76 (±3.30 standard deviation [SD]) cm. The female lays 23.16 (±7.03 SD) eggs on an average. The eggs hatch in 8–18 days. The larvae have five instars and complete their development in 30–45 days constructing larval galleries of 3.83 (±0.63 SD) cm in length. The larvae pupate for 18–28 days and finally the adults emerge to attack new suitable trees. The adults live for 45–70 days, and the total lifespan of this species ranges from 101 to 156 days. The seasonal distribution of various life stages and the number of generations were also recorded.

The first data on the biology of <italic>Ips stebbingi</italic> Strohmeyer, 1908 (coleoptera: curculionidae: Scolytinae), a pest of himalayan blue pine

Folia Forestalia Polonica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The first data on the biology of  Strohmeyer, 1908 (coleoptera: curculionidae: Scolytinae), a pest of himalayan blue pine

This paper deals with the studies on the biology and development of the bark beetle Ips stebbingi Strohmeyer, 1908 (Coleoptera: Curculionidae: Scolytinae), a...

Variable	n	Mean (mm)	Standard deviation (mm)
Eggs deposited	30	23.16 (number)	7.03
Egg length	30	0.72	0.03
Egg width	30	0.48	0.02
Larval length	30	3.00	0.13
Larval width	30	1.35	0.04
Pupal length	30	2.37	0.08
Pupal width	30	1.02	0.06
Female length	30	4.08	0.07
Female width	30	1.78	0.04
Male length	30	3.74	0.05
Male width	30	1.72	0.08

Duration of generations (days)
Stage	First generation	Second generation	Third generation
Egg	9–15	8–14	8–18
Larva	35–45	30–38	30–40
Pupa	20–26	18–24	21–28
Adult	60–70	45–60	140–175
Total	124–156	101–136	199–261

The first data on the biology of Ips stebbingi Strohmeyer, 1908 (coleoptera: curculionidae: Scolytinae), a pest of himalayan blue pine

Article Category: ORIGINAL ARTICLE

Published Online: Mar 13, 2023

Page range: 15 - 22

Received: Jul 06, 2022

Accepted: Nov 10, 2022

DOI: https://doi.org/10.2478/ffp-2023-0002

© 2023 Abdul Ahad Buhroo et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Table 4.

Figure 7.

Figure 8.

Figure 9.

Measurement of gallery length

Egg deposition and measurement of developmental stages of Ips stebbingi

Developmental duration of Ips stebbingi

Variable	n	Mean (cm)	Standard deviation (cm)
Maternal gallery length	30	10.76	3.30
Larval gallery length	30	3.83	0.63