Thursday, 19 August 2010
This plot belongs to Narayana Rai in Markanja.
Monday, 9 August 2010
The Mystery
Yes, I said that root grubs in my plot is reducing.But how? Is it from the insecticide application? If it is so from which insecticide?
Last year my plot was divided into six parts and each part had different insecticide treatment.Amongst them one part was left untreated.This year we could see reduced number of grubs in the whole plot.Even in the plot where no insecticide was applied,grubs number is reduced.Then the question remains-which insecticide did the wonders? I do not know. I think that if the methodology and time is maintained any good soil insecticide will do the work.It is for the scientists to explain.
One thing must be clarified.Still grubs are there in my plot.If the treatment last year was a failure young larvae of the last year will grow to adult and we could find a large number of third instar or adult grub this year.If the treatment was a success young larvae's of that year would die,but adult grubs will remain.That grubs will go to pupa stage and then became beetle.The beetles will emerge from the soil in the month of May or June and will lay eggs in the soil. Larvae's will emerge from the eggs later and hence we have young larvae's in the plot.When we say that reduced number of grubs we mean reduced number of grown grubs.
Then what is the effect of nematodes in the plot? Earlier I said that I had seen dead grubs in the plastic basket due to nematodes. But the problem is we cannot find dead grubs in the plot.Because if any grubs died in the plot it will decompose in the soil.Then how can we attribute reduced number of grubs to nematodes?Even with the nematodes,as Dr.Nagesh told adult grubs would not die easily.
Even if the grub problem seems to be reduced and I am now very happy person several questions were unanswered.Normally when I say grub problem is controlled I face one question-which insecticide did it? Frankly I could not answer.
Last year my plot was divided into six parts and each part had different insecticide treatment.Amongst them one part was left untreated.This year we could see reduced number of grubs in the whole plot.Even in the plot where no insecticide was applied,grubs number is reduced.Then the question remains-which insecticide did the wonders? I do not know. I think that if the methodology and time is maintained any good soil insecticide will do the work.It is for the scientists to explain.
One thing must be clarified.Still grubs are there in my plot.If the treatment last year was a failure young larvae of the last year will grow to adult and we could find a large number of third instar or adult grub this year.If the treatment was a success young larvae's of that year would die,but adult grubs will remain.That grubs will go to pupa stage and then became beetle.The beetles will emerge from the soil in the month of May or June and will lay eggs in the soil. Larvae's will emerge from the eggs later and hence we have young larvae's in the plot.When we say that reduced number of grubs we mean reduced number of grown grubs.
Then what is the effect of nematodes in the plot? Earlier I said that I had seen dead grubs in the plastic basket due to nematodes. But the problem is we cannot find dead grubs in the plot.Because if any grubs died in the plot it will decompose in the soil.Then how can we attribute reduced number of grubs to nematodes?Even with the nematodes,as Dr.Nagesh told adult grubs would not die easily.
Even if the grub problem seems to be reduced and I am now very happy person several questions were unanswered.Normally when I say grub problem is controlled I face one question-which insecticide did it? Frankly I could not answer.
Friday, 6 August 2010
SMELLING SUCCESS
As I was waiting for the scientists to visit my plot,Dr.Nagesh came in the month of July.He brought nematodes with him to apply.Along with my plot he applied them in the plot of Ashoka Bhat,Mairaje's plot too.
After one week Dr.Kumar sir along with Dr.Prakash and Papanna came.They went to Jagajeevan Rao's plot and gave suggestion to him in controlling the root grub.His plot is waterlogged and they asked him to immediately fork the land and remove the grubs manually.Afterwords he shall apply Imidacloprid to his plot.Then they went to Mairaje Ashoika Bhat's plot . There they could not collect enough grubs . Afterwords they came to my plot .We find very little grub activity this year.If the first application of the chemical was a failure we must had a large number of adult grubs in the plot. But what we had is only small[first instar] grubs. Very few adult grubs were seen. Scientists were pleased with the result. Dr. Kumar sir said that second application is not necessary.But to avert any human error in the sampling procedure ,they asked me to do second application. This year his preference is fipronil insecticide.
Arranging workers is another story. But however workers came this week and I started the work.I need a little more days to complete the application.Even workers too,who had seen my plot earlier,agrees to the fact that the plot is improved a lot.
Earlier we applied 20ml of chloropyiriphose per plant without success. But this year we could smell success with only 4ml chloropyiriphose per plant.This itself shows that timing and methodology of application is very important in controlling the grub problem.
After one week Dr.Kumar sir along with Dr.Prakash and Papanna came.They went to Jagajeevan Rao's plot and gave suggestion to him in controlling the root grub.His plot is waterlogged and they asked him to immediately fork the land and remove the grubs manually.Afterwords he shall apply Imidacloprid to his plot.Then they went to Mairaje Ashoika Bhat's plot . There they could not collect enough grubs . Afterwords they came to my plot .We find very little grub activity this year.If the first application of the chemical was a failure we must had a large number of adult grubs in the plot. But what we had is only small[first instar] grubs. Very few adult grubs were seen. Scientists were pleased with the result. Dr. Kumar sir said that second application is not necessary.But to avert any human error in the sampling procedure ,they asked me to do second application. This year his preference is fipronil insecticide.
Arranging workers is another story. But however workers came this week and I started the work.I need a little more days to complete the application.Even workers too,who had seen my plot earlier,agrees to the fact that the plot is improved a lot.
Earlier we applied 20ml of chloropyiriphose per plant without success. But this year we could smell success with only 4ml chloropyiriphose per plant.This itself shows that timing and methodology of application is very important in controlling the grub problem.
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