|Title:||螞蟻與鳳梨粉介殼蟲萎凋病關係之研究||Other Titles:||Studies on the Relationship of Ants with Mealybug Wilt of Pineapples||Authors:||孫守恭
|Issue Date:||11-Dec-1957||Publisher:||農業試驗所||Journal Volume:||7||Journal Issue:||4||Start page/Pages:||31-42||Source:||農業研究||Abstract:||
The present paper deals with the relationship of ants with pineapple mealybugs and their influence to pineapple wilt, a disease which is ensued from the infestation of pineapple mealybug (Dysmicoccus brevipes Ckl.)
Ants are frequent attendants of mealybugs in pineapple orchards. They are probably carriers of mealybugs from wild vegetations or adjacent pineapple orchards to new plantations. This assumption has been proved to be true to a certain extent from the guard row planting experiments, in which ant-killer insecticides were sprayed on the ground of the guard rows. Mealybug infestation and wilt in the main plantation were greatly reduced by these treatments.
If ants are effectively controlled in pineapple field, mealybugs will suffer an extraordinary change in their lives. Multiplication is naturally suppressed, colonies and population are gradually reduced to a ninimum, though not extinguished. The result is: wilt disappears and yield increases. This fact is considered to be very important in our practising of mealybug and wilt control. For insecticides so effective as parathion, etc., can not even kill the mealybugs completely as pineapple mealybugs are commonly hidden so low between the bases of leaf blades and on roots close to the plant. The application of organo-phosphorus insecticides is simply to suppress the population of mealybugs to such a degree as they are unable to induce wilt. This purpose can also be obtained by the controlling of ants. These two different methods of suppressing the population of mealybugs can be used alternatively and need further evaluation in our future studies of mealybug wilt control of pineapples.
There is no evident upward and downward migration of the pineapple mealybugs on pineapple plant, before the period of the fruits being sent out, due to the changes of temperature and precipitation. After fruiting, mealybugs have a tendancy to migrate upward to the fruits, crowns, and slips. Soon as the mealybugs reach these tender and succulent parts, they multiply tremendously. Numerous crawlers are produced within a short period. These mealybugs, however, can be detached from the mother plants through harvesting and collecting of the planting materials.
Ants can be found in pineapple orchards all year round in South Taiwan, but their activity is closely influenced by the atmospheric temperature. Low temperature greatly limits the activity of the ants.
Dieldrin was found to be the most effective insecticide for ant control in the author’s preliminary tests.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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