STUDIES ON IMPORTANT PESTS OF MANGO
Loading...
Date
2004
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD
Abstract
Studies on the seasonal incidence of important pests of mango
viz., mango leaf webber, Orthaga euadrusalis Walker, mango hopper
Amritodus atkinsoni Lethierry, mango fruit borer Conogethes
punctiferalis Guenee and varietal preference studies of mango leaf
webber O. euadrusalis were carried out at Fruit Research Station,
Sangareddy during June, 2003 to June, 2004. The leaf webber, O.
euadrusalis incidence was first noticed during 30th standard week (IInd
fortnight of July) and its peak activity was observed during 50th standard
week (1st fortnight of December). Among the significant weather
parameters, mean minimum temperature alone accounted for 62% of
total effect on the webber incidence. Amritodus atkinsoni incidence was
observed on the trunk region during 30th standard week (IInd fortnight
of July) and reached to peak by 42nd standard week (IInd fortnight of
October). There was no hopper incidence on panicles and young flush
during the study period. Among the significant weather parameters,
maximum temperature alone contributed 72% effect, on hopper
incidence.
The fruit borer incidence was low during the period of study and
the peak incidence never reached more than six percent and it did not
show significant correlation with any of the weather parameters.
The species composition of mango hoppers on Dashehari variety
revealed that Amritodus atkinsoni was the dominant species on trunk at
vegetative stage and Idioscopus niveosparsus was the major species
occurring on panicles and new flush. The occurrence of Idioscopus
scutellatus on panicles and new flush was observed for the first time in
Andhra Pradesh.
Screening of twelve mango cultivars under field conditions
against mango leaf webber showed that, six of the seven varieties viz.,
Banganpalli, Yerra mulgoa, Chinnarasam, Dashehari, Himayath,
Suvarnarekha and four of the five hybrids viz., Manjeera, Neeleshan,
Amrapali, Ratna were moderately resistant. Peddarasam variety and
Mallika hybrid were found to be highly susceptible. Though phenols,
nitrogen and potassium showed significant correlations with webber
incidence, phenols alone contributed 60 and 65% of resistance to
varieties and hybrids respectively.
Biology and morphometric studies of O. euadrusalis under
laboratory conditions (25 2C temperature 80 5%C) indicated that
the average fecundity of female moth was 58 eggs with 6.8 0.91 days
incubation period. The mean duration of larval, prepupal and pupal
periods were 40-44, 6.3 0.67 and 19.3 0.76 days respectively. The
female moths lived for longer time (7.6 0.51 days) compared to male
moth (5.3 0.48 days). Total lifecycle was completed in 80 to 84 days.
Description
Keywords
STUDIES, IMPORTANT, PESTS, MANGO,