If all the bees are dead from neurotoxins in insecticides and herbicides:

Then the only plants that will be pollinated will be crops people pollinate by hand and wild plants will all die that aren't cultivated for food worldwide. This will also help cause the extinction of 40% of more of insect species on earth as well. And if 40% of insect species die how many other animals and birds that eat only the  bugs going extinct are going to die too? And how far up the food chain will it go? Possibly to humans as well?