Bihar hairy caterpillar (Spilosoma obliqua) is a sporadic, polyphagous and voracious foliage feeder attacking several host species of different families. Its impact is more pronounced in certain species of Cruciferae family, notably cabbage. The goal of the current study was to identify methods for pest control that are efficient, economical, and sustainable in order to combat the Bihar hairy caterpillar infestation on cabbage. The research was conducted to measure the efficacy of eight plant extracts in Entomology laboratory, Lamjung Campus at room temperature from March to April, 2019. There were eight treatments viz. Asuro (Justicia adhatoda), Bakaino (Melia azedarach), Ban fada (Lantana camara), Bojho (Acorus calamus), Kaligadi (Solanum nigrum), Neem (Azadirachta indica), Titepati (Artemisia vulgaris) and Tobacco (Nicotiana tabacum) in the experiment. Pure cultured insects were tested against treated leaf with four replications of each treatment placed in Complete Randomized Design (CRD). Antifeedant effect and mortality tests were performed for 24 hours and 15 days respectively. The results indicated that all the plant materials posses some sort of antifeedant and mortality effect to the insect. The statistical analysis revealed that both antifeedant effect (87.85%) and mortality (100%) were maximum in bakaino followed by neem. The result demonstrates a great potentiality of utilizing plant extracts against the pest, and suggests the incorporation of botanical extracts would be future alternative in pest management.
Weeds are a constant nuisance for farmers, which steal space and nutrients from the crops. Weed management is the botanical component which attempts to stop noxious weeds from competing with desired flora and fauna including domesticated plants. It is preventing of non-native species competing with native species. Growth of various weeds has been major problem in the yield of many plants. It has also affected the growth and development of maize as it competes with the space and nutrients. Different weed management techniques have been introduced till date to increase the yield and to control the weeds, also, aiming less effect of the techniques on the main plant. Generally, preventive, biological, cultural, mechanical and chemical weed control methods are used. Advancements in plant biotechnology have allowed the development of a number of herbicide resistant crops which is a success in chemical weed management of the crops. They have provided the requisite tools to transform the plants to contain the foreign genes. Genetically engineered herbicide resistant crops have been widely planted globally since their introduction in 1995. These developments offer new approaches to managing weeds in cropping systems. This technology offers some advantages over currently used systems.
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