Working over a bowl, cut the corn kernels from the cobs at about half their depth. Then, using the back of the knife, scrape the cobs over the bowl to
release all the "milk" and set aside.

In a large saucepan, fry the bacon over moderately high heat, stirring occasionally until crisp, about 10 minutes. Transfer the bacon to paper towels to drain. Crumble and reserve. Discard all but 3 tablespoons of the bacon drippings from the pan. Add the onion and cook over moderate heat until golden, 4 to 5 minutes. Add the poblano pepper, jalapeño and celery, and cook until slightly softened, about 2 minutes. Add the tomatoes, potatoes, salt, allspice, sugar, bay leaf and the reserved corn kernels and their "milk" and stir well. Cook over moderate heat until mixture begins to sizzle. Reduce the heat to low. Cover and cook, stirring occasionally, until the potatoes are tender, 35 to 45 minutes.

Stir in the cream and milk, and bring just to a boil. Remove from heat and season with black pepper to taste. Ladle the chowder into bowls and garnish with the crumbled bacon and parsley.