scholarly journals Effect of Temperature, Relative Humidity and Natural Enemies on some Insect Pests Infesting Faba Bean Plants at El-Monofia Governorate

2017 ◽  
Vol 8 (9) ◽  
pp. 447-451
Author(s):  
M. Mahmoud ◽  
K. El-Khawass ◽  
S. Hammad ◽  
M. Ali
Keyword(s):  
Relative Humidity ◽  
Natural Enemies ◽  
Faba Bean ◽  
Insect Pests ◽  
Effect Of Temperature ◽  
Bean Plants

Seasonal Incidence of Pulse Aphid (Aphis craccivora Koch.) and its Natural Enemies on Field Pea (Pisum sativum L.) in Relation to Some Abiotic Factors in Alluvial Zone of West Bengal

2021 ◽  
Author(s):  
S. Pal ◽  
S. Samanta ◽  
A. Banerjee
Keyword(s):  
Relative Humidity ◽  
Pisum Sativum ◽  
Natural Enemies ◽  
West Bengal ◽  
Insect Pests ◽  
Field Pea ◽  
Pest Population ◽  
Pisum Sativum L ◽  
Aphis Craccivora Koch ◽  
Weather Parameters

Background: Field pea, Pisum sativum L. is an important winter-season pulse crop. It is subjected to damage by both field and storage insect pests and approximately 10-15 per cent reduction in yield was reported due to the infestation of different insect pests. Among these, pulse aphid (Aphis craccivora Koch.) affects plant physiology directly by removal of nutrients or indirectly by dispersal of various viral diseases. The present investigation has been aimed to study the seasonal fluctuations of aphids and their natural enemies as well as their correlation. Another objective was to know the effect of various weather parameters on pulse aphids and their natural enemies which ultimately would be helpful to develop a forewarning model.Methods: The field experiment was conducted at the A-B Block Farm of Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal using two varieties of field pea (KPMR 935 and IFPD 122) during rabi seasons of two consecutive years of 2017-18 and 2018-19 following a Randomized Block Design with three replications. After recording the total population of both pests (nymphs and adults) and their natural enemies across the season, the mean population was worked out and used for correlation and regression studies along with the weather parameters. Result: Maximum aphid population was noticed during the peak pod formation stage of the crop irrespective of the varieties. The pest population was very strongly correlated with the incidence of coccinellid and ant population in both test varieties. Among the weather parameters, both maximum and minimum temperature and sunshine hour showed a positive correlation with the pest population and their natural enemies but relative humidity and rainfall showed a negative correlation. Regression studies indicated that temperature and relative humidity were the most influencing factors over the incidence of aphid in both the seasons.

scholarly journals Spatial variation of important mulberry pests and their natural enemies

2017 ◽  
Vol 49 (1) ◽  
Author(s):  
A. Mohan ◽  
J. Ravikumar ◽  
D. Senthilkumar
Keyword(s):  
Relative Humidity ◽  
Spatial Variation ◽  
Natural Enemies ◽  
Significant Positive Correlation ◽  
Insect Pests ◽  
Food Plant ◽  
Positive Correlation ◽  
Ladybird Beetles ◽  
Unidentified Species

Mulberry is a silkworm food plant (<em>Bombyxmori</em>. L) that is seriously affected by many insect pests. The incidence of <em>Diaphania</em> <em>pulverulentalis</em> (Hampson), <em>Maconellicoccus</em> <em>hirsutus</em> (Green), <em>Paracoccus marginatus</em> (Williams and Granara de Willink), <em>Aleurodiscus</em> <em>dispersus</em> (Russels) and <em>Pseudodendrothrips</em> <em>mori</em> (Niwa) and their natural enemies, <em>viz</em>. coccinellids and spiders (/100 plants), were observed through survey and surveillance for 3 months. In February 2013, the incidence of insect pests in Vaikkalpattarai and Reddipudur villages (India) was: <em>D. pulverulentalis,</em> 1.20 and 0.85%; <em>P. marginatus</em>, 6.80 and 33.10%; <em>P. mori</em> 42.98 and 45.50%, respectively. Further, the infestation of <em>M</em>. <em>hirsutus</em> (1.40%) and <em>A. dispersus</em> (59.72%) was also observed in February at Vaikkalpattarai. The population of coccinellids was high in December (1.02 and 0.84/100 plants), but the spider population was even higher in February and January (1.04 and 1.81/100 plants). Population of pests had a significant positive correlation with relative humidity. The population of coccinellids and spiders have positive correlation with temperature and mulberry pests infestation. The natural enemies observed in the study were mostly the ladybird beetles, <em>Psyllobora</em> <em>bisoctonotata</em> and unidentified species of spiders.

scholarly journals INFLUENCE OF SOME VARIETIES ON THE MAIN INSECT PESTS ATTACKING FABA BEAN PLANTS

2013 ◽  
Vol 4 (6) ◽  
pp. 581-589
Author(s):  
S. Awadalla ◽  
F. Abdallah ◽  
Nora El-Mashaly
Keyword(s):  
Faba Bean ◽  
Insect Pests ◽  
Bean Plants

scholarly journals Silica nanoparticles as pesticide against insects of different feeding types and their non-target attraction of predators

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ahmed F. Thabet ◽  
Hessien A. Boraei ◽  
Ola A. Galal ◽  
Magdy F. M. El-Samahy ◽  
Kareem M. Mousa ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Faba Bean ◽  
Field Experiments ◽  
Insect Pests ◽  
Germination Percentage ◽  
Choice Test ◽  
Rove Beetles ◽  
Cotton Leafworm ◽  
Growing Seasons ◽  
Serpentine Leafminer

AbstractThe agricultural use of silica (SiO2) nanoparticles (NPs) has the potential to control insect pests while the safety and tritrophic effects on plants and beneficial natural enemies remains unknown. Here, we evaluate the effects of silica NPs on insect pests with different feeding niches, natural enemies, and a plant. Silica NPs were applied at different concentrations (75–425 mg/L) on field-cultivated faba bean and soybean for two growing seasons. The faba bean pests, the cowpea aphid Aphis craccivora and the American serpentine leafminer Liriomyza trifolii, and the soybean pest, the cotton leafworm Spodoptera littoralis, were monitored along with their associated predators. Additional laboratory experiments were performed to test the effects of silica NPs on the growth of faba bean seedlings and to determine whether the rove beetle Paederus fuscipes is attracted to cotton leafworm-infested soybean treated with silica NPs. In the field experiments, silica NPs reduced the populations of all three insect pests and their associated predators, including rove beetles, as the concentration of silica NPs increased. In soybean fields, however, the total number of predators initially increased after applying the lowest concentration. An olfactometer-based choice test found that rove beetles were more likely to move towards an herbivore-infested plant treated with silica NPs than to a water-treated control, suggesting that silica NPs enhance the attraction of natural enemies via herbivore-induced plant volatiles. In the laboratory, while silica NPs inhibited the development of faba bean roots at 400 mg/L, they did not affect germination percentage, germination time, shoot length, or vigor index compared to the control.

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