Streptomyces Lydicus After Harvest in Citrus

The period immediately after harvest is one of the most important yet often overlooked stages in citrus orchard management. Although fruit has been removed, citrus trees remain physiologically active and begin restoring nutrient reserves while producing new feeder roots for the next production cycle. Maintaining healthy roots during this recovery period helps prepare trees for future vegetative growth, flowering, and fruit production. Streptomyces lydicus is an effective biological biofungicide that supports this process by improving rhizosphere health.

Following soil drenching, drip irrigation, or fertigation, Streptomyces lydicus colonizes the feeder root zone and becomes part of the beneficial soil microbial community. It competes with disease-causing fungi for nutrients and colonization sites while producing naturally occurring antimicrobial metabolites that help suppress soil-borne pathogens such as Phytophthora, Fusarium, Rhizoctonia, and Pythium. Establishing beneficial microorganisms immediately after harvest allows them to become active before the next major growth phase.

Post-harvest is also an ideal time for root regeneration. Healthy feeder roots improve the absorption of essential nutrients including nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, zinc, boron, iron, manganese, copper, and molybdenum. These nutrients contribute to replenishing tree reserves needed for future shoot growth and flowering. Although Streptomyces lydicus does not directly increase flowering or yield, maintaining healthy roots supports the tree's natural ability to utilize available nutrients efficiently.

After harvest, many growers also apply compost, farmyard manure, vermicompost, biochar, and balanced fertilizers to restore soil fertility. Streptomyces lydicus complements these practices by contributing to a biologically active rhizosphere where beneficial microorganisms assist with nutrient cycling and organic matter decomposition. This combination helps build healthier soils over multiple production seasons.

The post-harvest period is also an excellent opportunity to improve long-term soil biology before environmental conditions favor disease development. Preventive biological applications reduce the opportunity for harmful pathogens to dominate the root zone during periods of reduced orchard activity.

Streptomyces lydicus integrates well with Trichoderma, Bacillus subtilis, Bacillus velezensis, Pseudomonas fluorescens, Azotobacter, Azospirillum, phosphate-solubilizing bacteria (PSB), potassium mobilizing bacteria (KMB), zinc-solubilizing bacteria, and mycorrhizal fungi. Together, these beneficial microorganisms improve microbial diversity, nutrient availability, root colonization, and long-term orchard sustainability.

Good post-harvest management also includes irrigation scheduling, pruning, removal of diseased plant material, weed management, soil testing, and correction of nutrient deficiencies where required. Combining these practices with biological root management provides a strong foundation for the next production cycle.

Commercial citrus growers increasingly include post-harvest applications of Streptomyces lydicus within Integrated Disease Management (IDM) and Integrated Nutrient Management (INM) programs. Whether cultivating orange, lemon, mandarin, sweet lime (mosambi), lime, grapefruit, or pomelo, applying Streptomyces lydicus after harvest helps maintain healthy roots, improve soil biology, support efficient nutrient uptake, and prepare orchards for consistent, high-quality fruit production in the following season.

Best Practice: Apply Streptomyces lydicus soon after harvest while soil temperatures remain favorable and feeder roots are actively regenerating to maximize rhizosphere colonization.