Efficacy of Crude Extract from Goatweed (Ageratum conyzoides L.) Leaves in Controlling the Cowpea Aphid (Aphis craccivora Koch.) under Laboratory Conditions
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Abstract
The efficacy of crude ethanol extract from Ageratum conyzoides L. leaves against the cowpea aphid (Aphis craccivora Koch) was studied at concentrations of 0, 1, 2, 4, and 8% (w/v). The experimental design was a completely randomized design (CRD). The results showed that the insecticidal, repellent, and anti-feedant effects of the A. conyzoides leaf extract on cowpea aphids were significantly different at the 95% reliability level when compared to the control. At 8% concentration, the mortality percentage was highest at 100%, and the LC50 values were 1.92 and 1.48% (w/v) at 24 and 48 hours, respectively. Regarding repellent efficacy, the highest repellent percentages against cowpea aphids were 72 and 100% at 12 and 24 hours, respectively. For anti-feedant efficacy, it was found that the number of probes on yardlong bean leaves increased as the extract concentration increased. At 8% concentration, the number of probes on yardlong bean leaves was highest at 9.40 ± 0.48 times/minute, while the control was 1.20 ± 0.48 times/minute. The penetration time for feeding decreased as the extract concentration increased. At 8% concentration, the penetration time of cowpea aphids was lowest at 0.24 ± 0.28 minutes, whereas the control was 7.62 ± 0.68 minutes.
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เนื้อหาและข้อมูลในบทความที่ลงตีพิมพ์ในวารสารวารสารวิทยาศาสตร์และเทคโนโลยีถือเป็นข้อคิดเห็นและความรับผิดชอบของผู้เขียนบทความโดยตรงซึ่งกองบรรณาธิการวารสาร ไม่จำเป็นต้องเห็นด้วย หรือร่วมรับผิดชอบใด ๆ
บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการตีพิมพ์ในวารสารวารสารวิทยาศาสตร์และเทคโนโลยีถือเป็นลิขสิทธิ์ของวารสารวารสารวิทยาศาสตร์และเทคโนโลยีหากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาตเป็นลายลักษณ์อักษรจากวารสารวารสารวิทยาศาสตร์และเทคโนโลยี ก่อนเท่านั้น
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