Broccoli (Brassica oleracea L. var. italica) cultivars, Palam Samridhi and Palam Vichitra affect the growth of Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae)

Abstract

Effect of the ethyl acetate seed extracts of two cultivars of broccoli, Brassica oleracea Italica, Palam Samridhi (PS) and Palam Vichitra (PV) on growth, development and nutritional physiology of an economically important insect pest, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae) was evaluated by conducting bioassays and nutritional assays. The insect larvae were fed on diets amended with the seed extracts of two cultivars at different concentrations viz. 5, 25, 125, 625 and 3125 ppm and taking water as control. The response of the insect varied with plant varieties. The extracts disrupted the developmental cycle of the pest. Larval mortality and total adult emergence were negatively affected. Larval period and total development period were also negatively influenced. Nutritional indices of S. litura also showed considerable decrease in the RGR, RCR, ECI and ECD as compared to control. The AD values were also enhanced with both the cultivars. The findings of the study revealed a considerable anti-insect potential of the two extracts and needs to be further explored for identification and isolation of bioactive constituents from broccoli for efficient management of the pest population.

Acaricidal, Larvacidal, and Repellent Activity of Elettaria cardamomum Essential Oil against Hyalomma anatolicum Ticks Infesting Saudi Arabian Cattle

“…Herbal essential oils have been shown to exhibit insecticidal and acaricidal effects through direct mechanisms, such as the interruption of some biological pathways by frustrating tissue injuries that may be due to the provoking the free radical's production [25]. Acetylcholinesterase (AchE) is one of the main hydrolytic enzymes in the nervous system of insects and ticks which is involved in the balanced transduction of neuronal signals through the rapid hydrolysis of the acetylcholine mediator in the synaptic gap [26]. Here, we found that ECEO, especially at the 1 / 2 LC 50 and LC 50 , significantly inhibited the AChE activity of H. anatolicum larvae in comparison with the control group.…”

Chemical Compositions and Fumigation Effects of Essential Oils Derived from Cardamom, <em>Elettaria cardamomum</em> (L.) Maton, and Galangal, <em>Alpinia galanga </em>(L.) Willd Against Red Flour Beetle, <em>Tribolium castaneum</em> (Herbst) (Coleoptera: Tenebrionidae)

“…Additionally, α-pinene and β-caryophyllene were found to have repellent action against S. zeamais [58,59], while α-pinene also exhibited potential fumigant activity against S. zeamais [60]. [61]. Plant-derived volatiles, such as those affecting the octopaminergic mode of action, have neurotoxic effects [62].…”