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Effect
o
f Climatic Variability Infestation Population of Different Insect Pest of Maize Crops
28
Table 1 Infestation level of leaf hopper in relation to temperature and R.H. under unsprayed condition
SMW Date
Insect infestation population (mean) Temperature (mean) max &min Relative humidity %(mean)
31
30~5 Aug-11
0.65
30.4
83
32
6~12 Aug-11
1.05
28.6
75
33
13~19 Aug-11 1.15
28.6
73
34
20~26 Aug-11 1.95
36.2
75
Table 2 Infestation level of jassid in relation to temperature and R.H. under unsprayed condition
SMW Date
Insect infestation population (mean) Temperature (mean) max &min Relative humidity % (mean)
32
6~12 Aug-11
0.80
28.6
73
34
20~26 Aug-11 1.95
36.0
75
Table 3 Infestation level of stem borer (
Chilo particllus
) in relation to temperature and R.H. under unsprayed condition
SMW Date
Insect infestation population(mean)
Temperature (mean) max &min Relative humidity % (mean)
34
20~26 Aug-11 20.2
31.2
75
35
27~02 Sep-11 30.8
32.0
75
36
03~09 Sep-11 33.8
28.6
80.5
37
10~16 Sep-11 37.0
30.1
85.5
38
17~23 Sep-11 55.0
29.5
85
Table 4 Infestation level of aphid in relation to temperature and R.H. under unsprayed condition
SMW Date
Insect infestation population(mean)
Temperature (mean) max &min Relative humidity % (mean)
37
10-16 Sep-11
3.12
30.1
85.5
31
30-5Aug-11
2.32
30.4
83
2 Material and Method
These studies were carried out in Krishi Vigyan
Kendra research area under Rajmata Vijyaraje Scindia
Krishi Vigyan Kendra, Zonal Agriculture Research
Station, Morena, M.P. During the year 2011~2012.The
experiment was laid out in randomized complete
block design (RBD) on four verities of maize viz.,
PEHM-2, Maharaja, NK-6240, NK-30. Having four
replications. Plant to plant distance was 25 cm. and
row to row distance was 50 cm. Thus the experiment
was spread over a plot of about 250 m
2
of an area and
research area was divided with 16 plots. The plots
were surveyed weekly for the presence of the pests
from July to September, 2011. However, the data on
the pests population after their be coming active on
04-08-11 were collected by selecting plants / plots at
random and by taking visual count of the insect pests
up to 25-09-11when they had virtually vanished from
the field. The data of infestation of stem borer
collected by selecting 10 plants in each plots and
count the population of leaf hoper, jassid and aphid by
selecting 5 plants/plots. Similarly, the data on different
climatic factors like, temperature and relative
humidity obtained from the meteorological
observatory of Zonal Agriculture Research Station
Morena (IASS services Morena M.P.). The data thus
obtained subjected to standard statistical analysis, so
that to determine the effect of temperature and relative
humidity on the population of different insect-pests of
maize under unsprayed conditions.
References
Aasman K., 2001, Effect of temperature on development and
activity of maize stem borer
Chilopartellus
, Bull. Environ.
Ent. Research, 125-127
Isard S.A., Spencer J.L., Mabry T.R., and Eli Levine, 2004,
Influence of atmospheric condition on high elevation
flight of Western corn rootworm, Environmental
Entomology, 33(3): 650-656
http://dx.doi.org/10.1603/0046-225X-33.3.650
Tamiru A., Getu E., Jembere B., and Bruce T., 2012, Effect of
temperature and relative humidity on the development and
fecundity of
Chilo partellus
(Swinhoe) (Lepidoptera:
Crambidae), Bull Entomol Res., 102(1): 9-15
http://dx.doi.org/10.1017/S0007485311000307
PMid:21672294
Muhammad A.Z, Muhammad A.S., Muhammad A.R., Amir
Hamza, Asim Hayat, and Ahsan Khan, 2010, Effect of
Temperature and Relative Humidity on the Population
Dynamics of Some Insect Pests of Maize, Pak. J. Life Soc.
Sci., 8(1): 16-18
Woodson W.D., and Gustin R.D., 1993, Low temperature effect
on hatch of western corn rootworm eggs, J. Kansas
Entomol. Soci., 66 (1):104-107
Molecular Entomology