Biochemical constituents influencing the incidence of leafhoppers on different mango genotypes (original) (raw)
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Five different popular mango cultivars (Fazli, Guti, Lakhanbhog, Gopalbhog and Langra) of Malda, West Bengal, India were screened for the mango mealy bug (Drosicha mangiferae G.) population in panicle and trunk throughout the pest infestation period during 2018 and 2019. The average pest number at peak time (13 Standard Meteorological Week or SMW) of infestation indicated that maximum pest number of 132.57 and 28.05 was noted in the 30 cm branch of inflorescence and 10 cm 2 area of the trunk in Fazli cultivar. Whereas, minimum number of 20.27/ 30 cm branch of inflorescence and 6.36 in the same area of trunk was found in Langra. Study of various biological parameters of mealy bugs also indicated the the order of infestation of the five cultivars as Fazli>Guti>Lakhanbho g>Gopalbhog>Langra. Analysis of various biochemical parameters revealed that there was a significant positive correlation between pest density phagostimulants like sugar, protein, moisture and nitrogen. Significant negative correlation was observed between pest number and alkaloid, flavonoid, phenol, tannin, ascorbic acid as well as crude fibre suggesting their pivotal role in low pest incidence. By considering the adjusted R 2 in stepwise multiple regression model, it was noticed that tannin was the most significant factor (39.2 %) followed by nitrogen (15.5 %), flavonoid (11.4 %), phenol (7.7 %), ascorbic acid (6.9 %) and protein (6.2 %) to influence pest number. Factors like moisture (1.0 %), sugar (2.7 %), antioxidant (1.0 %) had minor contributions. Therefore, it can be concluded that a combination of factors influence pest density and a single factor is not adequate to affect the pest population. The study is helpful in understanding the host preference of mealy bug.
Evaluation of different biopesticides against mango leafhoppers
International Journal of Chemical Studies, 2018
Mango leafhoppers are an important insect pest in mango ecosystem. Attempt was made to evaluate different biopesticides against mango leafhoppers. Among eight treatments imposed for the management of mango leafhoppers the treatment with Azadirachtin 5 EC (12.71 leafhopper / inflorescence) recorded significantly lower number of leafhoppers followed by Azadirachtin 1EC (14.41 leafhopper / inflorescence) and Lastraw 30 per cent (15.71 leafhopper / inflorescence). However, the standard check imidacloprid 17.8 SL @ 0.25 ml/lit recorded significantly lower number of leafhoppers (3.93 leafhopper / inflorescence). Highest yield of 65.12 q/ha was recorded in the treatment with Imidacloprid 17.8 SL. The economic analysis of different bio pesticides, imidacloprid gave highest returns with C: B ratio of 1: 3.13. Azadirachtin 5 EC stood second in giving returns with a C: B ratio of 1: 2.38 followed by Azadirachtin 1 EC (1: 2.30).
International Journal of Plant & Soil Science
The only purpose of conducting this research is to know the diversity of insects. This research is completely field based, which was selected at different twelve locations of Jawaharlal Nehru Agricultural University, Jabalpur, Madhya Pradesh campus. In this research, 38 insect pests with different species were recorded whose nature of causing harm has been told. The principle insect pests of mango are hopper, mealy bug, midge, fruit fly, bark eating caterpillar, shoot borer, leaf webber and stone weevil.
International Journal of Agricultural Invention, 2019
A survey study was conducted to assess the major insect pests of mango and their control measures at farmers’ level in Shurunga Municipality of Saptari district, Nepal. Madhupatti, Kushaha, Shripur and Haripur of the Shurunga Municipality were selected for the study. From these areas 120 household samples were selected randomly. Primary data were collected using semi-structured questionnaire, focus group discussion and key informant interview whereas secondary data were obtained through a review of relevant literatures. Thus obtained data were analyzed using statistical software that involved both descriptive and analytical statistics. Mango hopper was identified as the most common insects followed by the mango mealy bug, red banded caterpillar, mango stem borer and mango fruit fly in terms of occurrence and damage in orchard of study area. It was found that orchard having high insect severity also had high yield loss. Malda variety of mango was identified as the most susceptible va...
The Indian Journal of Agricultural Sciences
Mango hopper is an important pest of mango that causes severe losses in yield and lower quality of fruit. The objective of the study was to investigate the susceptibility of mango hopper to the selected chemical and botanical insecticides and to find out the efficacy of different concentrations of selected insecticides/botanicals in controlling the mango hopper in the field conditions. Field experiments were conducted at four locations of Punjab, viz. Gurdaspur (Regional Research Station), Hoshiarpur [Government Garden and Fruit Nursery, Khiala Bulanda; FRS, Gangian; Jhandia Kalan (Ropar)] to evaluate different botanicals and chemicals along with Malathion 50 EC as check insecticide during 2019–21. Results indicated that lambda-cyhalothrin 5 ec @1.0 ml/l, imidacloprid 17.8 SL @0.4 ml/l, deltamethrin 2.8 ec @0.5 ml/l, thiamethoxam 25 wg @0.1 g/l, dimethoate 30 ec @1.65 ml/l, buprofezin 25 sc @2.0 ml/l, oxydemeton methyl 25 ec @1.0 ml/l and malathion 50 ec @1.5 ml/l were found signifi...
Journal of entomology and zoology studies, 2019
The mango hopper is one of the major devastating pest of mango at flowering stage. The present investigation on influence of abiotic factors on the incidence of mango hopper and the result indicated that the mango hoppers appeared during last week of October with 1.70 hoppers per twig/panicle. The hoppers population continued to build up and attained peak incidence (12.38/twig/panicle) during third week of February at flowering stage (7th standard meteorological weeks). Declining trend of hoppers population was recorded from last week of February, when tree enters in fruiting stage. The lowest hopper population (0.13/twig/panicle) was recorded during first week of April at fruit maturity stage (14th standard meteorological weeks). The correlation coefficient studies revealed that hopper population and weather parameters were found negative and non-significant correlation with temperature and rainfall whereas, positive and non-significant correlation was calculated with relative humi...
Journal of Entomology and Zoology Studies, 2019
In an investigation carried out during Kharif 2018, bio-efficacy of nine insecticides and bio-pesticides (including control) were tested against major sucking pest Leafhopper, Empoasca kerri Pruthi of groundnut at S.K.N. College of Agriculture, Jobner (Rajasthan). On the basis of mean per cent reduction in leafhopper population the treatment of imidacloprid 17.8SL (84.31%) was found most effective, followed by thiamethoxam 25WG (81.66%) and acetamiprid 20SP (80%) and were also statistically at par with each other in their efficacy. Bio-pesticides Metarhizium anisopliae 1.15 WP (33.56%) and NSKE (Neem Seed Kernel Extract) (49.68%) were proved least effective, however both were differed significantly with each other. The descending order of effectiveness of treatments were as imidacloprid > thiamethoxam > acetamiprid > methyl demeton > fipronil > acephate > NSKE > Metarhizium anisopliae. The highest pod yield was obtained from the plot treated with insecticide imidacloprid (27.16 qha-1) followed by thiamethoxam (26.58 qha-1) and acetamiprid (26.11 qha-1) and were statistically at par with each other.