Co-Authors:
Ben-Yakir, D., Dept. of Entomology, ARO, Volcani Center, Bet Dagan 50250, Israel
Hadar, E., Extension Service, Ministry of Agriculture, Rehovot 76324, Israel
Chen, M., Dept. of Entomology, ARO, Volcani Center, Bet Dagan 50250, Israel
Abstract:
In Israel, narcissus bulb flies (Diptera: Syrphidae) are serious pests of cultivated flower bulbs of the families Liliaceae and Amaryllidaceae. The large narcissus fly (Merodon eques) is the major pest, whereas the small narcissus fly (a new species in the genus Eumerus, yet to be described) is only a secondary pest. The large narcissus fly is also considered a quarantine pest by the U.S.A. authorities. Narcissus bulbs, Narcissus tazetta (vat. 'Ziva'), were planted in an experimental held at Bizzaron during November 1995 and harvested during June 1996. Currently aldicarb (Temik) is recommended for the control of narcissus fly larvae. We compared the control efficacy of imidacloprid (Confidor) and isazofos (Miral) with that of aldicarb. These latter insecticides were applied to the soil in February, in April, or on both dates. The mean level of damaged bulbs in the untreated plots was 32%. Two applications of aldicarb, one in February and one in April, reduced the damage to the lowest level of 0.5%. A single application of aldicarb in February, and two applications of imidacloprid - one in February and one in April - reduced the damage to 5-10%. Treatments with imidacloprid in February or in April, reduced the damage to 12-13%. Neither one application of aldicarb in April, nor any of the treatments with isazofos, was effective. In all treatments, larvae of the large narcissus fly were found in only approximately one-third of the damaged bulbs. The level of infestation with the small narcissus fly in the untreated bulbs was only approximately 2%. The effects of the insecticide treatments on the small narcissus fly were similar to those recorded for the large narcissus fly.
תפריט נגישות
ניגודיות עדינה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
להורדת מודול נגישות חינם
