 Hi, so welcome back, after understanding the different levels of injury levels in the pest, now one question arises, does the pest status on a crop will remain same at all the times? Well to certain extent it is S, these pests can be categorized into a different kinds, so based on the different parameters. Now in this class let us look at what are the different categories of the pest that we can make, so first of all the pest can be categorized based on their occurrence, we can actually categorize them as the regular pest, in the sense these pest will regularly occur on a particular crop and they will have a very close association. For example the rice tambourine or the fruit borer in case of brinjal, whenever you grow these crops then these pests are bound to occur, so indicating their closer association with the crop. Some pest can be called as an occasional pest, in the sense their occurrence is not quite frequent and they do not have a closer association, so for example the rice caseworm, it mean to say that you may not expect this pest to occur whenever the crop is been grown, but at the same time they may suddenly appear and may cause the economic damage. Now some insects are referred as the seasonal pest, in the sense these pest will occur during a particular season every year, the sense, so best example you can give is a one pest on ground nut or a peanut which is called as a red-headed hairy caterpillar, sometimes the mango hoppers. So whenever the ground nut is grown especially during the monsoon season, this pest will occur on this crop and then cause the damage. And some pests are referred as the persistent pest which actually persist on the crop throughout the year and it is quite difficult to control, like on chili we have the chili thrips, so the pest will occur on it and then persistently it keeps causing the damage right from germination to the harvesting period. Then fifth category that we can make is of a sporadic pest where here the pest will occur in isolated localities during some period of time, so best example I can give is the coconut slug caterpillar. Now based on the level of infestation, the pest can be classified as an epidemic pest, in the sense there will be a sudden outbreak of this pest which will be in a quite severe form over a larger area. So the best example I can give is in a recent time that we had a wide fly outbreak in Punjab and Haryana, so where this pest caused a real havoc and cotton. Similarly we have a several instance where, so like for example the sugarcane woolly aphid which was quite epidemic quite some years back in Karnataka and Maharashtra and second category we can make in this is the endemic pest. Here the pest occurs in a low level in certain packets but it occurs regularly and it is confined to a particular area, for example the rice-galmage infestation in the coastal belt of Karnataka and the Kerala where this pest is seen only all along the coastal border and in certain pockets it regularly comes and hence such pest are named as endemic pest. Then third categories of the pest we can make based on the economic injury level and the general equilibrium position. So we can call the pest as a key pest and if you look at the graph here in case of key pest or the pest which comes under this category the general equilibrium position of this pest population will be much higher than the economic injury level and so we need to frequently go for the interventions or a management practices to bring this population below the economic threshold level and keep it at a particular modified GEP we call it as and always such type of pest are quite severe and they cause a huge economic loss. The best example that we can give is a diamond back moth or cabbage and cauliflower. The second category is the major pest and of course the major pest will also have the GEP which is higher than the EIL but they will be quite close to the economic injury level and with a timely intervention for managing this pest so the pest can be easily brought down below the economic threshold level. Then the third type that we can see is the minor pest or the occasional pest. In this minor or the occasional pest if you look at the GEP will be much lower than the economic threshold level but occasionally sometimes the population will suddenly increase and then go beyond the economic injury level wherein we need an intervention and then keep bringing it below the economic threshold level. Then we have this sporadic pest in this sporadic pest also the GEP will be much lower than economic threshold level but occasionally or unexpectedly the population will increases and go beyond the economic injury level and cause the economic damage. Then we do have the potential pest where the pest population will be much much lower than economic threshold level but we do not know that when they become a major one and they are quite potential to become a major one and we should have a constant watch and walk over these pest. So in this class now we learnt about the different categories of the pest based on the different factors and then understood their level of incidence and their nature of damage. Thank you.