PREVENTION OF COMMON DISEASES AND INSECT PESTS OF TREE PEONY

1) Disease, leaf spot: infected stems and leaves are the source of infection. Often occurs in spring, summer, the main damage to the leaf, stem, petiole will also be affected. Control Methods: The diseased stems and leaves were found, and the fallen leaves were cut off and burned up, and 1∶1∶100 Bordeaux Mixture was sprayed before and after the onset, once every 10 days, several times in succession.

1.Peony Rust: residual leaves are the source of infection. In april-may when the rain, warm humid or low-lying conditions, mainly harm the leaves, june-august onset serious. Methods of prevention and control: The residual leaves of the diseased plants were burnt after harvest, the high furrow planting was done on dry land with good drainage, and at the initial stage of disease, the mixture of 0.3-0.4 degree of lime-sulphur or 97% of difenugreek sodium was sprayed 400 times, once every 7-10 days, for many times in succession.

2.Sclerotinia Sclerotiorum: Sclerotinia soil is the source of infection. Cause stem, leaf ministry disease more in spring. Can occur from seedling stage to adult stage. Prevention and control methods: Crop rotation with cereal crops; in the spring when more rain, do a good ditch drainage, reduce humidity, reduce the incidence of disease; early detection of disease plants, with soil dug out, disease points with lime disinfection, if necessary, surrounding spray 50% tobrazine 1000 times liquid.

3.Sclerotium Rolfsii of peony : The soil and fertilizer with pathogen are the infectious source of the disease, especially when sweet potato and soybean are used as the former crops, the disease is serious. The root and root-stem diseases usually occur before and after anthesis, in high temperature and rainy season.

4.Methods of control: rotation with gramineous plants, not with root medicinal plants and sweet potato, peanut, broad bean and other crops; planting with 50% tobrazine 1000 times soaking seed buds; found the plant with soil dug out burned, sick points with lime disinfection.

5.Root Rot: Disease Residues or seedlings in the soil are the source of infection. The main damage is to the roots. The disease is serious in rainy season. As the disease gets worse, the whole plant dies. Prevention and cure method: Prevention and cure of Sclerotinia Sclerotiorum 

2). Insect pest, white GRUBS: Larvae of the bronze-green Chafer. All Year round, from May to September. Damage to the roots, bite into uneven holes or incomplete broken, resulting in the above-ground part of the weak or withered, seriously affect the yield and quality. Prevention and control methods: In the morning, the victim seedlings, plants, Open Kill; light trapping adult; with 50% phoxim EC or 90% trichlorfon 1000-1500 times solution poured into the root; 3% carbofuran granules 2 kg per mu, mixed with moist soil 20-50 kg; Combine intertillage with weeding along the Ridge.

1.Small Ground Tiger: also known as “Ground Silkworm” , is a multi-feeding underground pests. Generally in spring and autumn, the most serious damage, often from the ground bite off seedlings or bite ununearthed seedlings caused by seedlings cut off. Methods of prevention and control: Before Sunrise in the early morning, killing in the vicinity of the seedlings; in the early larval stage, spraying with 98% trichlorfon crystal 1000 times liquid or 50% PHOXIM EC 1000 times liquid; in the advanced larval stage, poisonous bait can be used to trap and kill the Larvae Dissolve 98% trichlorfon crystal or 50% PHOXIM EC 100-150 G in 3-5 kg water per mu, spray 15-20 kg chopped fresh grass or other green manure, mix evenly while spraying, disperse around the seedlings in the evening Can have a very good effect of prevention and treatment.

2.Borer: Occurs in the spring, adults in the rhizome to lay eggs, after hatching, larvae drill into the root, gradually up borers, light of the stem and leaves withered yellow, heavy plant death. Control Methods: to find the injured plants, break the roots and stems, and kill the pests; to spray 80% or more trichlorfon 800-1000 times liquid, or to spray 2.5% trichlorfon powder per mu.

3.Termites: Because of the application of cake fertilizer often easy to lure termites, eat root bark, damage buds, injured leaves roll yellow. The control method: apply cake fertilizer before the termites come out of the hole, do not touch the root, pour 200-500 times solution of 50% phoxim or water of new tea cake.”2en”