Aktivitas Insektisida Ekstrak Tithonia Diversifolia (Hemsl.) a Gray (Asteraceae) Terhadap Ulat Daun Kubis Plutella Xylostella (L.) (Lepidoptera: Yponomeutidae)

Abstract

Insecticidal activity of extracts of Tithonia diversifolia (Hemsl.) A. Gray (Asteraceae) against the diamondback moth Plutella xylostella (L.) (Lepidoptera: Yponomeutidae). The diamondback moth, Plutella xylostella (L.) (Lepidoptera: Yponomeutidae) is one of the most destructive pests on cruciferous plants. Generally farmers use synthetic insecticides to control this pest. Intensive and excessive use of insecticides can cause some undesirable effects such as resistance, resurgence, and contamination of insecticide on environment. One effort to solve the problems caused by synthetic insecticides use is by utilization of botanical materials that are potential to be used as botanical insecticides, one of them is Tithonia diversifolia (Asteraceae). The purpose of this research was to study the insecticidal activity of T. diversifolia as a botanical insecticide against P. xylostella. The leaf residual and topical application methods were used to assess the mortality effect of the extracts. Insect mortality rate was analyzed using probit analysis to obtain LC50 and LC95 values. The results showed that the flower extract had better activity on insect mortality than the leaf extract both in leaf residual and topical application treatments.

Bioactivity of extracts from Syzygium aromaticum, Annona muricata, and Piper retrofractum against Spodoptera frugiperda J. E. Smith (Lepidoptera: Noctuidae)

“…The concentrations of the three extracts in this test were in accordance with LC15, LC55 and LC95 values and controls [10,15]. The method used is the residue on the feed leaves with no choice.…”

“…The method used is the residue on the feed leaves with no choice. Each group of feed leaf pieces (4 cm x 4 cm) consisting of two leaf pieces were weighed to estimate the wet weight [10,15], then dipped into the extract preparation according to treatment and control, then drained. Each Petri dish (9 cm diameter) contained two pieces of treatment leaves or two pieces of control leaves that lined with tissue and infested 10 FAW first-instar larvae.…”

“…After that, the leftover fresh feed leaves were also dried in the oven then weighed to determine the final dry weight. The dry weight of leaves eaten by FAW larvae was obtained from the difference between the initial dry weight and the final dry weight [10,15]. The percentage of feeding inhibition with no choice was calculated using the following formula [16]:…”

“…(Piperaceae) fruits [5,6,7]. The repellency ability of botanical insecticides can be used as inhibition of feeding activity and oviposition deterrence to reduce damage and prevent yield loss in plants due to insect pest attack activity [6,8,9,10,41].…”

PEMANFAATAN DAUN KIPAHIT (Tithonia diversifolia) SEBAGAI ALTERNATIF PENGENDALIAN HAMA KEONG MAS (Pomacea canaliculata L.) PADA TANAMAN PADI.

“…Tanaman kipahit (T. diversifolia) merupakan salah satu tanaman yang dapat dimanfaatkan sebagai bahan baku pembuatan pestisida nabati. Ekstrak daun T. diversifolia dimanfaatkan sebagai insektisida nabati terhadap wereng batang coklat (Mokodompit et al, 2013), walang sangit (Rozi et al, 2013), ulat daun kubis (Firmansyah et al, 2017), hingga rayap (Oyedokun et al, 2014). Larvasida terhadap larva lalat Crysomya bezziana (Wardana dan Diana, 2014).…”