Tomato, the important vegetable crop faces yield loses by foliar disease, Early Blight caused by Alternaria solani and infestation by tobacco cut worm, Spodoptera litura. Synthetic pesticides used ...

Bacterial compounds, as biocontrol agent against early blight (Alternaria solani) and tobacco cut worm (Spodoptera litura Fab.) of tomato (Lycopersicon esculentum Mill.)

A laboratory experiment was carried out during 2014-2015 to study the effect of toxins of Bacillus subtilis isolates on the biochemical profile of newly ecdysed 3rd instar Spodoptera litura larvae fed for 24 h on castor oil bean leaves treated with 1000 and 2000 ppm concentrations by leaf dip and larval dip methods at Tamil Nadu Agricultural University, Coimbatore. There was a severe reduction in total protein content of larvae when treated with the isolate KA3 (55.24 mg g-1) followed by VB1 (56.90 mg g-1) at 2000 ppm by leaf dip method and total lipid content after 48 h was decreased (11.38 mg g-1, 12.33 mg g-1) in larvae treated with isolate VB1 at 1000 and 2000 ppm by the leaf dip method. Isolate VB1 showed higher GOT (Glutamic-oxaloacetic Transaminase) enzyme activity (24.43 units ml-1, 22.76 units ml-1) at 2000 ppm.

https://www.entomoljournal.com/archives/2017/vol5issue5/PartX/5-5-285-910.pdf

Impact of Bacillus subtilis isolates on biochemical profile of Spodoptera litura (Fab.) larvae

Laboratory study was carried out during 2014-2015 to screen a total of ten bacterial strains (Bacillus subtilis VB1 and KA3, B. tequelensis, B. cereus, B. amyloliquefaciens, Ocrobactrum sp, Paenibacillus sp, B. pumilus, B. methylotrophicus, B. megaterium) that are commonly used for pest/disease control were prepared at 1×108 spores /ml concentration and bioassays were conducted both by leaf dip and larval dip of third instar larvae, and a control. Among the ten bacterial strains using the leaf dip method, the highest mean cumulative mortality in 72 h was shown by B. subtilis isolates VB1 (56.67%) followed by KA3 (46.67%). Whereas in larval dip method, the highest mean cumulative mortality at 72 h was caused by B. subtilis isolates VB1 (30.00%) followed by isolate KA3 (23.33%).

https://www.entomoljournal.com/archives/2017/vol5issue5/PartX/5-5-284-334.pdf

Laboratory studies on the influence of Bacterial strains against Spodoptera litura (Fab.)

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Impact of Bacillus subtilis isolates on biochemical profile of Spodoptera litura (Fab.) larvae

Laboratory studies on the influence of Bacterial strains against Spodoptera litura (Fab.)