ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Species Diversity of Cotton Insect Pests)

ผู้เขียน:Ohnmar Khaing, ดร.ประภารัจ หอมจันทน์, ศาสตราจารย์, นายสุรเชษฐ จามรมาน, รองศาสตราจารย์, Ngarmchuen Ratanadilok, นางอรุณี วงศ์ปิยะสถิตย์, ศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

Field experiments were conducted at Suwan Farm, Northeastern Thailand during two growing periods of 2000 and 2001 to determine the species diversity and abundance of insect pests of cotton. Randomized Complete Block Design (RCB) was arranged with four replications of sixteen plots of four cotton varieties/lines. Weekly sampling was performed by visual count and pan trap methods. Species diversity of insect pests was analyzed by Shannon-Weaver diversity index. Species abundance of insect pests was computed for each crop together with eight sampling dates. Species ranking was also developed from species abundance. The results showed that insect pests were greatly abundant during the first crop while low diversity indices were observed. During the second crop there was less appearance of insect pest. The total species abundance of all varieties/lines ranged from 10 (cotton spiny bollworm, Earias sp.), to 11,431 (cotton leafhopper, Amrasca biguttula Ishida), in the first crop and from 11 (Earias sp.), to 1,955 (A. biguttula), in the second crop. The ranges of species diversity indices were from 0.27 [Sri Samrong 60 (SR 60)] to 0.62 [Sarid 1 (SD1)], in the first crop and from 0.61 (SR 60) to 0.83 (SD1), in the second crop. A. biguttula was observed to be the dominant species in both crops. Other insect pests with less obvious importance were Thrips palmi, Bemisia tabaci, Aphis gossypi, Megacoelum biseratense and Carpophilus sp. Although total of 28 species found on cotton, only 13-14 insect pests appeared in the cotton field regularly. Two rare species did not occur on some cotton varieties/lines during the second crop.

Article Info

Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 036, Issue 2, Apr 02 - Jun 02, Page 124 - 132 |  PDF |  Page

ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Diversity of Stingless Bees (Apidae: Meliponini) in Thong Pha Phum District, Kanchanaburi Province, Thailand)

ผู้เขียน:ยุวรินทร์ บุญทบ, ดร.สาวิตรี มาไลยพันธุ์, รองศาสตราจารย์, Kosol Chareansom, ดร.เดชา วิวัฒน์วิทยา, รองศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

Stingless bees were observed in four types of undisturbed forest: dry dipterocarp forest (DDF), upper mixed deciduous forest (UMDF), lower mixed deciduous forest (LMDF) and dry evergreen forest (DEF) during April 2004 to March 2005 to determine the diversity and abundance of stingless bees. Monthly sampling was performed using honey-bait traps. Diversity was analysed using the Shannon- Weiner diversity index. Species abundance was computed for each forest type. Three genera and eleven species (Trigona ventralis, T. collina, T. sirindhornae, T. terminata, T. apicalis, T. thoracica, T. canifrons, T. fuscobalteata, T. melina, Pariotrigona pendleburyi and Lisotrigona cacciae) were recorded; Trigona ventralis, T. sirindhornae, T. collina and T. terminata were the most abundant. Species diversity indices ranged from 0.63 (DDF) to 0.86 (LMDF). Species richness and abundance data indicated the following clustering of forest types based on the stingless bee fauna: (((LMDF+UMDF) + DDF) + DEF). Stingless bees were most abundant during cooler, drier months and in seasons and forest types where the percentage of light transmittance was the greatest.

Article Info

Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 042, Issue 3, Jul 08 - Sep 08, Page 444 - 456 |  PDF |  Page