Plants are infected by a wide range of biotic and abiotic factors which reduces the yield. In addition to the various pests and pathogens associated with plants, there are certain plants which reduce the yield of plants. Such plants are called as phanerogamic parasites i.e. flowering plants which parasitize the plants. These phanerogamic parasites are the most ignored parameters of plant pathogens. A detailed knowledge of these phanerogamic parasites is essential as it can reduce the yield by 20-80%. Sometimes the phanerogamic parasites can destroy the entire cultivation. Thus it is essential to have detailed knowledge of these phanerogamic parasites.