With a 550 rank in ICAR PG Plant Science, you have a fair chance of securing admission in Plant Pathology or Genetics and Plant Breeding (GPB) in some of the top agricultural universities. However, the specific cutoff for these courses varies each year depending on factors such as the number of applicants, seat availability, and category reservation.

Institutes like the Indian Agricultural Research Institute (IARI) and other state agricultural universities tend to have higher cutoffs for popular courses like Plant Pathology and GPB. While your rank might be competitive for mid-tier colleges, securing a seat in top-tier institutions might be challenging unless the cutoff trends for this year are more lenient.

I recommend closely monitoring the counseling process and applying to multiple institutions to increase your chances. You may also explore other state agricultural universities where the cutoffs are generally lower.