Certainly. Plants experiencing abiotic stress will have lower fungal infestation when the organism is to infect through stomata or leaf surfaces due to accumulation of surface waxes. Marshener Book on plant nutrition, has one chapter dedicated.

Dear Balraj, the impact of environmental stresses depends on the nature of pathogen under your focus as well as on the stress agent, itself. For example, if You consider plants under drought stress, such plants are more susceptible to a pathogen like Macrophomina phaseolina. Nutritional stresses can lead to increased susceptibility to the pathogens like Cytospora spp., and Alternaria spp. Then, dear Voleti's idea needs some correction. To me, generally the necrotrophic pathogens take advantage of stress conditions that cause decreased vitality of affected plants, while such conditions are expected to lead to decreased susceptibility to biotrophic pathogens.

The answer can be related to the concept of the "Disease Triangle": Disease depends on the interaction of pathogen-host-environment. Our research shows that plants under heat stress are more susceptible to diseases caused by the fungus Phytophthora capsici and the virus Tomato spotted wilt virus.

Endophytic fungi help the host plant to over come several stress including abiotic stress.

Abiotic stresses can change the balanced status of some fungus-plant associations already mutually beneficial but no longer so. Some Armillaria or Armillariella fungi that are not virulent enough to overcome plant resistance act as ectomycorrhizal mycobionts and the association is kept in balance. So the balanced association is of symbiotic kind and both organisms take advantage of each other. However, under stressed conditions, the interrupted physiology of plant resistance is no longer strong enough to keep the fungus in balance, and the association shifts from symbiosis to parasitism. As the result, the plant is rotted and eventually dies.

We have found that Phytophthora capsici has increased incidence and severity under crop heat stress conditions in bell pepper.