Imagine arriving in Hawaii and realize that the majority of coconut trees on the islands have become extinct. This would discover that the flowers associated with Hawaii - hibiscus and orchids - have disappeared from the landscape of this remote tropical paradise thousands of miles from the valley, surrounded by the Pacific Ocean. An insidious, devastating "cancer" would kill the coconut trees, Hawaii, at an alarming rate - 15 percent of trees were destroyed by a deadly pathogen known as Phytophthora katsurae, causing heart rot of coconut . What are the symptoms of loss of Phytophthora? Abnormally small in nearly mature nuts was a common sign of early disease. Infected fruits have dark, mottled spots and rots. expansion of irregular brown infected area often creates a green stain or circular islands of green tissue surrounded by infected areas. Soaking water is also common on large and immature fruit is dark green, fatty tissue adjacent to the affected areas. Young fruits of patients less than three inches long are usually brown with no marbling. Internally, the envelope of the elderly infected fruit is reddish-brown to red. Infected meat, or endosperm is white, cream-colored or slightly brown. The pathogen can penetrate ripe fruit growing through the pores of germination at the end of the rod nut. The first symptoms of young or mature trees are wilting, discoloration, and death of the youngest leaf. Unfurled leaves lance may also die earlier in the disease. dead fronds are unusually shaped, but remain attached to the trunk for a few weeks, falling on or between the older leaves green. In the months that followed, more leaves die and fall, leaving a little lower fronds. The roots and lower trunk tissue stay healthy and functional for many months, and continue to provide the lower leaves of nutrients and moisture. Eventually all the leaves fall, the production of bare trunks. Less frequently, older leaves die first, resulting in trees with only a few young leaves right. Because young leaves are oriented vertically infected plants seem rigid. On the death of timesheets is observed, the internal heart rot is at an advanced stage. These diseased trees have large areas that involve the most rotten of the terminal bud. Murder of the tip of vegetation eventually causes the death of the palm. nuts and sick of heart rot, followed by plant death, were associated with a species of Phytophthora. The pathogen produces abundant coconut and distinctive sexual spores in the host tissue. Each spore is produced in a mother cell has distinctive blister-like bulges and base length. How to fight against PathogenOnce trees are infected, the death of the disease appears to be inevitable, and several hundred trees were lost throughout Hawaii since 1970. Because the host range of Phytophthora appears to be confined to the coconut, eradication and exclusion are the control options as possible. All infected trees and nuts shall be destroyed by incineration or deep burial. rapid removal of diseased trees will reduce the likelihood of soil contamination by the pathogen. The sexual spores of most species of Phytophthora can survive in soil without host plants. Removal of diseased material will also prevent the spread of the pathogen to healthy trees. Many diseased trees were found in moist areas of wind Kauai, Big Island and Oahu and Maui. Producers should avoid collecting planting materials of coconuts from these areas. As mature trees can be infected but remain asymptomatic for several months, a careful selection of nuts and clean healthy plants and trees is necessary. Stock plants or seedlings should be grown in relatively dry areas to minimize the establishment of the pathogen into new plants. Because the epidemiology of the disease in Hawaii is not known, the precise means by which the deviations of pathogens are not specifically known. Based on studies of other Phytophthora diseases, however, the wind-driven rain, insect feeding and movement or activities of other small animals are probably important factors in the spread of the disease. Moisture promotes strong growth, spore production and spread of the pathogen and disease development by Phytophthora. Sexual spores of the pathogen occur in large numbers in the envelopes of patients and trunks. These thick-walled resistant structures enable the pathogen to survive for long periods in a dormant state. The pathogen is seed-transmitted form of sexual spores are common in the envelope of diseased fruit. The removal of clusters of nuts and heavy thinning of large trees may have helped spread the disease. microscopic spores from diseased tissue contaminating cutting tools and infect healthy trees during pruning operations later. In addition, wounding the stem base by cutting green fronds exposed plant tissues very sensitive to pathogenic infections. Where possible, tree pruning should be done in dry weather. Tools should be cleaned and then immersed in disinfectant after trimming operations are completed on each tree, especially at sites known to have the disease. Fungicides such as Subdue 2E (metalaxyl), Dithane M-45 (mancozeb), Aliette (fosethyl-Al), and Truban (ethazole) are known to be an effective guard against the disease Phytophthora others, but they are ineffective in curing trees rotting advanced terminal bud or heart. limited control of the disease at an early stage can be achieved by removing the fruit from diseased trees with no young leaves, then protect the wound surface with a putty size, which prevents the progression of disease in the chest. A good plan is to plant coconut trees more often. The life of a coconut tree may be only 15 to 25 years with this disease in Hawaii, so the young trees should be planted regularly. From Genesis to epidemic ProportionsCoconut trees had been relatively free of the disease in Hawaii, before the discovery of Phytophthora katsurae in 1971 by Dr. Minoru Aragaki from a sample taken at Wailua, Kauai, according to the University of Hawaii College of Tropical Agriculture and Human Resources (CTAHR) in Honolulu. Infected trees died in the year. Aragaki and Dr Janice Uchida worked on the disease over the years. During the 1980s, Phytophthora has been found on Oahu, Maui and Big Island as well. Interisland movement of nuts, seedlings, and trees, and pruning operations, has probably contributed to the escalation of the disease in epidemic proportions. Concerned that the icon of a centuries-old Hawaiian would disappear in the not too distant future, experts here have launched a concerted effort to combat heart rot of coconut. Philippe Visintainer, owner and operator of Hawaii Coconut Protectors on Maui, leading the fight against Phytophthora with a boundless zeal. "The University of Hawaii has begun research on Kauai in the late 80s," Visintainer said. "Hurricane Iniki hit Kauai in 1992 and destroyed the research plot. Nothing was done to control the disease in the environment until I resumed the project in the late 90s. I managed a plantation of tropical Maui. I planted many trees coconut on properties, and I noticed that some trees died. I was worried about it, so I talked to the University of Hawaii, Department of Agriculture specialists and other pathogens. "Visintainer invited experts from around the world to Maui to help establish research plots. They experimented with different formulas to fight against the pathogen. Visintainer was on the board of the Maui Farm Bureau for about six years. As part of the board, he called for a bill to the Legislature the State of Hawaii in 2000 to extend the research on heart rot of coconut. The bill was passed and $ 10,000 was allocated to the project. Visintainer realized that research on Phytophthora would be hampered, if not all-out war against the pathogen. Make a commitment "I stopped working at the plantation and started a company called Hawaii Coconut Protectors," Visintainer said. "We were broadcasting a video on public television on all the islands, describing the spread of heart rot of coconut and what we do to combat it. Our approach was to educate the public about the pathogen. We met people in the landscape industry in collaboration with the University of Hawaii. We conducted the research. We offered an injection program throughout the state that protects the coconut trees of the pathogen. Other than that, we promote the eradication. In years to come, we want to implement an eradication program through a federal grant. We have not yet applied for a grant because it is not the right time to ask for money. "The formula injection was a success, according to Visintainer. He has worked with hotels, resorts, condos and private landowners in Hawaii. Visintainer is also trying to get the Maui County to take action against the pathogen. His company has developed a formula based on acid phosphorus. Visintainer refers to it as the approach of building nutrients. The injection promotes the overall health of a coconut tree and fertilize. At the same time, it creates an environment in the heart of the palm-repellent agent. "We put trees at about chest height, and the formula is systemic, the tree will form up the leaves and down into the heart of the palm in about two to four weeks, depending on the tree" , Visintainer said. "We achieved a 95 percent success with healthy trees. We're not sure how to spread the pathogen, whether by way of rodents, pruning trees, or insects. It seems that the wind-driven rain is an important factor. It moves with the wind and rain, and is found in the crown of the tree and made its way into the heart of the palm. "Visintainer registers typically five to 15 percent of infected trees. Most of the time, when he examines the trees, and people have realized they have a problem, the trees are rotten. There is nothing Visintainer can do at this point. There are 350 species of the pathogen in the world, and has invaded many different plants, ranging from pineapple to oaks. Visintainer speculates that the pathogen arrived in Hawaii, where travelers brought plants and materials here. At this stage, the pathogen is unique to the coconut trees in Hawaii. He started on the windward side of islands, but has extended to the leeward side of islands. Visintainer identified infestations on golf courses. He reasons that maintenance crews deliver volumes of water to keep the course green, the coconut trees to receive water volumes too. Educate the public "This encourages the spread of the pathogen, because it thrives on moisture," Visintainer said. "In Hawaii, we have high levels of humidity and moisture. People care about the pathogen, if they were aware of that. We are probably talking about tens of thousands of coconut trees. If you have a dead tree to the pathogen, only a shaft of perhaps a grove of 50 trees, so it is often difficult to recognize the pathogen and its potential to infect other trees. When the tree is sick and died, trimmer can come and cut the tree. There are still 49 trees of coconut, so it does not appear that there is a serious problem. However, you do not expect 30 percent of the population is infected with AIDS, to recognize the problem. Until then, you lost the battle. "With the coconuts, the experts can manage the pathogen before it is out of control, according to Visintainer. He received the support of many people. "We charge a fee for the injections, which is $ 20 per tree, coconut, and if there are 50 or more trees, we charge $ 15 per tree," Visintainer said. "There is now much more aware that there are five to 10 years. There is a good possibility that we will win the battle. "CommunityDr A spokesman for the research. Jeri Ooka, plant pathologist, Department of Plant Science and Environmental Protection, College of Tropical Agriculture and Human Resources (CTAHR), University of Hawaii to Kauai, began working on the disease during 1982 to 1985 the epidemic and recognized the phase of the fruit rot disease. Ooka demonstrated the pathogenicity of isolates of the pathogen. During the mid 1980's Drs. Aragaki, Uchida, Norman Nagata and others in the group Uchida confirmed the pathogenicity of Phytophthora katsurae on fruits and seedlings. These experiments were the first who identified the causal agent, as pure cultures of the pathogen were placed on healthy hosts, who have become sick. Molokai has not been well studied, but it seems to be immune to the disease on the leeward side of the island, according to Ooka. It is certain that the bud rot caused by pathogens was here in 1971. It is likely that the disease was here in 1966. Removal of trees around the last 30 years has spread faster than the pathogen, it would spread naturally. The value of trees has made the disease more visible. Each tree is worth more than $ 1,000 and trees are extremely difficult to replace. "From 1982 to 1992 several field trials have been implemented to test various fungicides for control of the disease," Ooka said. "The first test involved placing the copper-based fungicides in the whorl leaves of the tree. Later tests were usually with different rates of systemic fungicides metalaxyl and fosethyl Al-spray, dipped or injections. Potassium phosphite compound was the last to be added to tests. The last official event, I realized in 1992. This trial was abruptly interrupted by Hurricane Iniki. All tests were successful with Al-fosethyl and potassium phosphite shows the best promise and metalaxyl least. "The formula to inject coconut trees has been derived from South Africa, U.S., European and Australian publications reporting use of metalaxyl, fosethyl-Al, Al-injectable fosethyl potassium phosphite and Control Phytophthora diseases, according to Ooka. The disease is known to familiar landscape with coconut trees. brushcutter almost always know of the disease, but not necessarily the details. Owners, boards condominium, park wardens of the hotel, and greens of golf courses guardians aware of the disease as it affects their trees. Ooka note that bud rot will never eliminate all the coconuts in Hawaii. Ooka explained that Hawaii is a dynamic biological system with many factors affecting the balance between pathogen and host, resulting in the presence or absence of disease. There are biological reasons, economic, cultural, aesthetic, and to preserve the coconut trees. Cocos nucifera is the only species that remain of its kind. It is a traditional herb for economic tropical lowlands, which provides most of the raw materials for survival in the livelihood systems and tropical ocean. For industrial economies, coconut oil is both an important raw material for manufacturing products. He acquired a cultural significance in societies that depend on it. "This is an important ornament, which identifies Hawaii and other places like a tropical paradise for tourists," Ooka said. "The pathogen is never completely eradicated. In this sense, we can not win a war against it. As the host changes, so do pathogens. Sometimes the environment is allied with the host, other times with the pathogen. Our goal is to keep disease severity and occurred at an economically acceptable level. "Implementation of directors of public health goes a long way towards this, according to Ooka. There are things people can do to prevent the pathogen spread, such as starting plants from seed tubers, taken from healthy trees, produced in a dry environment. Ooka recommends germinated seeds in a mixture containing good, amended with compost suppressive disease. Once they are planted in the field, plants should not be too watered fertilized. The trees of damp, cold regions have a higher probability of being infected should not be used for transplantation. "Do not plant trees in inappropriate locations," Ooka said. "For example, do not plant trees in an environment conducive to health and unfit for coconut. This includes most sites more than 1,000 feet high, or more than 100 centimeters of rain per year, on the windward side of the island. If you plant in these areas, the tree will survive no more than 20 years. In endemic areas bud rot, the trees will probably succumb to the disease in 10 to 15 years. In dry areas suitable for coconut, nitrogen fertilizer and watering must be monitored to avoid creating too many tissues susceptible to the pathogen "If Visintainer, other experts and the community in Hawaii can a successful war against Phytophthora -. and win - and their commitment to protect and preserve trees of coconut in the islands will be useful. The arduous process of educating the public about the disease, as well as rising awareness and concern, it is a good start. Meanwhile, another coconut tree dies with each passing day - leaving less a symbol of Hawaii for future generations.
yousharknotpass
izzy806
titsay
janainaart
germansingergirl