Control of pests and diseases of black pine
As an important landscaping tree species, black pine is widely popular for its unique ornamental value. However, in the actual maintenance process, pest and disease problems often pose severe challenges to growers. This paper systematically combs the identification characteristics and scientific control plans of common pests and diseases of black pine, and provides practical management suggestions based on years of garden maintenance experience. Black pine disease control system dead branch occurrence mechanism As the main disease of black pine, dead branch disease is a weak parasitic fungus. The spores of the pathogen can be spread through wind and rain, forming latent infections on the surface of the tree. When extreme weather (continuous rain/drought/freezing damage) causes tree resistance to decline, the bacteria will break through the epidermal defense layer and spread rapidly along the vascular bundle. The disease has the characteristics of strong concealment. At the beginning, only sporadic branches appear to be withered, but it can lead to the death of the entire plant within 2-3 years. The comprehensive prevention and control plan establishes a three-level defense system: ① Strengthen cultivation management, use circular ditch application method (80-100cm away from the main trunk) to apply decomposed organic fertilizer, and combine it with NPK compound fertilizer to regulate soil fertility;② Implement physical isolation and clean up vegetation within 5 meters of the affected area;③ Chemical control uses a compound formulation of difenoconazole + azoxystrobin to spray foliar during the spring shoot growth period. Black pine pest management strategy The main pest identification is that the larvae of the pine moth (Dioryctria splendidella) eat the tender shoots of the year, causing "decapitation" phenomenon; Dendrolimus spp. Larvae flock to feed on needles and spread and harm after the third instar. The key monitoring period is the adult emergence period from April to May, and population dynamics can be monitored through sexual traps. Ecological prevention and control technologies build a biological control network: ① hang artificial bird nests to attract beneficial birds such as great tits;② interplant insect repellent plants such as rosemary in the forest;③ use Bacillus thuringiensis (BT inoculant) for biological control. It is recommended to use beta-cyhalothrin microcapsules for chemical control and apply precise application during the initial incubation period of larvae (late May).
By establishing a plant protection system that "puts prevention first and comprehensive management", combined with regular tree growth assessment (March/6/September every year), soil improvement (pH value maintained at 5.5-6.8), and reasonable pruning (maintaining crown width light transmission rate of 40%) and other supporting measures can effectively improve the stress resistance of black pine and achieve sustainable and healthy management of garden plants.