Hello sirs/ madams, am working on the seasonal incidence of pest and disease incidence in field crops. I want to know the how to calculate the pest and disease incidence in the field?
Hi Professor,
Please do follow the conventional methods as taught in the Agriculture University.
Dear, Rajashekhar Mandla, you can know the calculated the pests or disease by calculating the number of pests for random plant samples
Take 4 100 plant random samples and count the number of plants infected that will give an incidence at that date of record.
Once the field is infected with a saturated incidence the percentage of area of lesion coverage or pictographic severity scales are used.
These severity scales vary from disease to disease and you will need to look they up.
Confirm the diagnosis of all the diseases you are working with as many diseases have similar symptoms.
The formulae in calculating percentage of disease severity and incidence are:
Disease Incidence=Total no. of infected plant/Total no of plant assessedX100
Disease severity= sum of individual ratingsX100/no of plant assessed X maximum scale
The maximum rating scale (0-5) which is used for calculating the percentage of disease severity is: Rating Scale: Disease percentage 0 (No infection), 1 (1-5% infection), 2 (5-25% infection), 3 (25-50% infection), 4 (50-75% infection), 5 (75-100% infection).
Português - Brazil. Esta pergunda está muito ampla. Você precisa relatar em qual cultura e principalmente o que se aproveita para a Cultura. Por exemplo, para o milho: se deseja a produção de grãos os insetos e doenças que atacam os grãos são mais importantes do que aqueles que atacam as folhas.
Por outro lado, se deseja o aproveitamento do milho para forragem as doenças que atacam as folhas são muito problemáticas. Elas competem em proteína e largura da folha. Concorda?
Você podia especificar melhor a sua pergunta. Ela está muito vaga.
English - United States This question is very broad. You need to report in which culture and mainly what if takes to the culture. For example, for the corn: if you want the grain production of insects and diseases that attack the beans are more important than those who attack the leaves. On the other hand, if you want the use of forage maize for the diseases that attack the leaves are very problematic. They compete in protein and width of the sheet. Do you agree? Could you clarify your question. It´s very vague.
When possible to count the number of pest we calculate Incidence using the abandon of pests. If not possible then incidence calculation based on pest damage on crop. Agree?
I agree with Manisha Phour answer......This is the general method used by me in case of determining disease incidence.
Constult this graphic and review the established economic thresholds for the crops you are working with.
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