Monocrotophos residue levels in coconut leaves kernel and water

Ma C.K., . and Lim K. P., . and A. Sivapragasam, . and Mohd Jusoh M., . and Razali B., . and Ayub Din, . (2010) Monocrotophos residue levels in coconut leaves kernel and water. [Proceedings Paper]

The residue level of injected monocrotophos in coconut var. MATAG; 3 year old leaves kernel and water was determined in a supervised study. The treatments were an untreated check; a single application of monocrotophos Azodrin 60WSE 55 a.i at 10ml/palm recommended rate and 20 ml/palm. Generally leaves recorded the highest residue levels amongst the samples tested. In the leaves residue levels exceeded MRL 0.05 ppm at all the sampling dates commencing from day 4 days after treatment DAT until 77 DAT. The residue level was higher with increased application rate. In the kernel detectable levels of monocrotophos were seen beginning 7 DAT. At the recommended rate the MRL was exceeded at 7 28 43 and 49 DAT after which it was not detectable. In the 20 ml/palm treatment the pesticide was detectable even until 77 DAT. In the coconut water generally residue levels in the water were higher than the kernel. As in the kernel monocrotophos residues applied at recommended rate were detected at 7 DAT. MRL was exceeded at 7 22 28 35 43 and 49 DAT. After that there were still residues of monocrotophos present in the water but the levels were below the MRL. On the other hand high levels of monocrotophos were detected in the water in the 20 ml/palm treatment until 77 DAT. The results indicated that even at the recommended rate 10 ml/palm residues of monocrotophos were above the MRL until 49 DAT in the kernel and water of young tender coconut and until 77 DA T if applied at higher rate 20 ml/palm. Considering the relatively high residue in the edible components of the young nut and the levels and distribution in the leaves can be help towards managing leaf feeding insect pests it is recommended that the use of monocrotophos for trunk injection be limited to only palms in the immature stage.

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Abstract

The residue level of injected monocrotophos in coconut var. MATAG; 3 year old leaves kernel and water was determined in a supervised study. The treatments were an untreated check; a single application of monocrotophos Azodrin 60WSE 55 a.i at 10ml/palm recommended rate and 20 ml/palm. Generally leaves recorded the highest residue levels amongst the samples tested. In the leaves residue levels exceeded MRL 0.05 ppm at all the sampling dates commencing from day 4 days after treatment DAT until 77 DAT. The residue level was higher with increased application rate. In the kernel detectable levels of monocrotophos were seen beginning 7 DAT. At the recommended rate the MRL was exceeded at 7 28 43 and 49 DAT after which it was not detectable. In the 20 ml/palm treatment the pesticide was detectable even until 77 DAT. In the coconut water generally residue levels in the water were higher than the kernel. As in the kernel monocrotophos residues applied at recommended rate were detected at 7 DAT. MRL was exceeded at 7 22 28 35 43 and 49 DAT. After that there were still residues of monocrotophos present in the water but the levels were below the MRL. On the other hand high levels of monocrotophos were detected in the water in the 20 ml/palm treatment until 77 DAT. The results indicated that even at the recommended rate 10 ml/palm residues of monocrotophos were above the MRL until 49 DAT in the kernel and water of young tender coconut and until 77 DA T if applied at higher rate 20 ml/palm. Considering the relatively high residue in the edible components of the young nut and the levels and distribution in the leaves can be help towards managing leaf feeding insect pests it is recommended that the use of monocrotophos for trunk injection be limited to only palms in the immature stage.

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	Monocrotophos
AGROVOC Term:	Coconuts
AGROVOC Term:	Kernels
AGROVOC Term:	Water
AGROVOC Term:	Leaves
AGROVOC Term:	Trunks
AGROVOC Term:	Harmful insects
AGROVOC Term:	Insect pests
AGROVOC Term:	Malaysia
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:14
URI:	http://webagris.upm.edu.my/id/eprint/11416

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