How to manage plant rotting problem in bitter gourd crop

This disease occurs due to sudden drop and rise in temperature. Plant rotting fungal disease develops in the soil.
It is a soil borne disease, in this disease, the stem of the bitter gourd plant turns black and gummy secretion comes out from the middle part of the stem due to which the main nutrients do not reach the upper part of the plant and the plant dies
For prevention of these disease use Azoxystrobin 11% + Tebuconazole 18.3% SC@ 300 ml/acre or Kasugamycin 5% + Copper Oxychloride 45% WP@ 300 gram/acre or Chlorothalonil 75% WP@ 400 gram/acre or Thiophanate Methyl 70% W/W@ 300 gram/acre
As biological treatment use Trichoderma Viride@500 gram/acre or Pseudomonas Fluorescens@ 250 gram/acre
Always sow crops only after soil treatment and seed treatment.