|Title:||菊花害蟲之發生與防治||Other Titles:||Insect Pests of Chrysanthemum and Their Control in the Field||Authors:||劉達修
|Issue Date:||May-1984||Publisher:||臺灣省農業試驗所||Related Publication(s):||農業試驗所特刊第14號||Start page/Pages:||139-146||Source:||臺灣花卉之生產改進||Conference:||花卉生產改進研討會||Abstract:||
In Taiwan, chrysanthemum grown is primarily for export and has helped earn large sum of foreign exchange for the country. In recent years, destruction by fire or mandatory fumigation has often been imposed on the cut flowers exported to Japan because of the infestion by live insect pests. These actions result either in downgrading of quality of the cut flowers or serious reduction of farmers¡¦ income. This article describes some results of the work on insect pests of chrysanthemum performed in this station, and makes assessment of the control measures taken by farmers which need improvement.
Surveys of several years indicate that among the more than 10 different insect pests on chrysanthemum, aphids, thrips and mites occur most frequently. Lepidopterous insect pests, though occurring only sporadically, bring much trouble. Higher populations of sucking-type insect pests are found in dry seasons due to the inhibitory action of continuous rain on population density. This suppressive action is less apparent to the chewing-type insects pests. The ununiformity of culturing period of chrysanthemum makes the effort of timing of control difficult, which generally must vary with planting time. In general, 1 to 2 sprays are necessary during early stage of the plant (before soil banking and setting up supporting nylon net). According to need, 1 to 2 sprays at an interval of 7 to 10 days can be made before blooming. The most critical stage for exporting chrysanthemum is between the budding and time of cutting. Three to 5 sprays at an interval of 3 to 5 days are absolutely necessary. Screened from more than 20 insecticides are 6 insecticides including 25.3% EC mevinphos for aphids, 2 for thrips, and 5 including 50% WP Plictran for mites. Significant reduction of afficacy of some insecticides has been noticed in the field and this may indicate development of resistance of insects due to continuous application of insecticides for many years.
Because of the many varieties of chrysanthemum which react differently toward insect pests and insecticides, it is recommended, for insect pest control, that insect-resistant varieties should be preferred to those susceptible to insecticides and thus easily showing phytotoxicity symptoms. Improvement of culturing techniques may decrease the occurrence of insect pests which may have favorable effect on their control. Discarded plant parts and abandoned fields which may become the sources of infestation must be carefully taken care of. Strengthening of cooperative pest control program and searching for new control measures will eventually ensure overcoming of the difficulties encontered in the field.
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