PHÒNG TRỪ BỌ CẮT LÁ HẠI XOÀI VÀO MÙA MƯA Trong mùa mưa, xoài ra đọt non rất nhiều, đây cũng là nguồn thức ăn cho các đối tượng sâu bệnh hại. Trong đó, bọ cắt lá là côn trùng khá phổ biến. Hiện nay, trên các vườn xoài giai đoạn đọt non đang xuất
Category Archives: Tra Cứu Bệnh & Côn Trùng
CÁCH PHÒNG VÀ TRỊ BỆNH THÁN THƯ TRÊN HOA SEN Trên lá: Vết bệnh ban đầu là những đốm tròn nhỏ hoặc không có hình dạng nhất định, màu nâu nhạt dưới lá, sau chuyển sang màu nâu sậm có viền đỏ hặc quầng vàng lan rộng xung quanh. Vết bệnh điển hình và đặc
ROSE ROSETTE ON ROSE PLANT CAUSAL ORGANISM: This “disease” appears to be vectored by a blister mite but the causal agent has not been identified. Some plant pathologists think that it is a virus while others, incuding entomologists, think that the disease is the result of the blister mite feeding. Mosaic is probably the most
ROSE SPRING DWARF DISEASE CAUSAL ORGANISM: A virus is suspected in causing this disease. SYMPTOMS: Rose mosaic usually appears in spring as a distortion of growing tips or expanding leaves. Later the leaves can appear to be wavy and have yellow lightening patterns, oak leaf patterns or simply gold to yellow veins. Plants infected with
ROSE MOSAIC ON ROSE PLANT CAUSAL ORGANISM: Prunus Necrotic Ringspot Virus: Mosaic is probably the most commonly found virus on roses but many other virus diseases also exist. While mosaic is transmitted by propagation other viruses can be transmitted by pollen, insect feeding or simply by mechanical contact. Symptoms of virus are usually dramatic manifestations of
BACTERIAL CROWN GALL ON ROSE PLANT CAUSAL ORGANISM: Agrobacterium spp: This is really the only serious bacterial disease of Rose. The bacteria is found world wide wherever roses are grown and is especially severe in loose sandy or sandy loam soils. SYMPTOMS: On roses the symptoms of overgrowths can occur at the crown, bud union or
RUST ON ROSE PLANT CAUSAL ORGANISM: Phragmidium spp: The rust of rose is one of the most commonly found and easily identified diseases of rose. Severe outbreaks occur where cool temperatures and high moisture are found during the prime growing season. Where foliage is heavy, the first symptoms usually are found close to the ground and
ROSE CANKERS ON ROSE PLANT CAUSAL ORGANISM: Coniothyrium spp: After a long cold wet winter, roses can be expected to have some dead and cankered canes. While these pathogenic fungi are not very sophisticated, they can cause considerable damage. The problems can be especially acute on old established roses that have lost some vigor and on
BOTRYTIS BLIGHT ON ROSE PLANT CAUSAL ORGANISM: Botrytis cinerea: Botrytis blight is common in all parts of the world. This fungus is not a specific pathogen and can take advantage of many situations to produce a blight or rot condition on many hosts. It is an opportunist on cut or pruned rose canes and will infect
ANTHRACNOSE ON ROSE PLANT CAUSAL ORGANISM: Sphaceloma rosarum: Not much is known about this disease, however, it can be severe under cool moist spring conditions. Wild rose, climbers and ramblers seem most susceptible but hybrid tea and bush roses also get the disease. SYMPTOMS: Initially leaf spots are about .5 cm diam and black, which makes