Effectiveness of Selected Cultural, Biological and Chemical Methods Singly or in Integration as Management Options against Kongwa Weed (Astripomoea hyoscyamoides Vatke Verdc.)

Kongwa weed (Astripomoea hyoscyamoides Vatke Verdc.) cause’s damage on
pasture productivity. This study was carried-out to evaluate the effectiveness of
cultural, biological and chemical methods singly or in integration as management
options. The experiment was conducted at two sites 2.2 km apart within Kongwa
District Dodoma region. Site A located at 06.06225S, 36.34204E and 992 masl,
characterized with low weed population, and site B located at 06.07862S,
36.32756E and 962 masl, characterized with high weed population, both with
sandy loam texture. A randomized complete block designs with four replicates
were used at both sites. Site A contained five treatments while site B had 12
treatments as weed management techniques applied in paddocks occupied with
buffel grass (Cenchrus ciliaris) and star grass (Cynodon dactylon), respectively.
Results showed that, at site A treatment M. azedarach significantly affected the
number of Kongwa weed survivor (5) and number of weed leaves (7), similar effect
observed on pasture yield of (8.9 ton ha-1) in the same treatments at p<0.001.
However results on site B showed that, number of weed leaves (14), height (37.55
cm) and girth (3 mm) were significantly affected at p<0.001 by 2,4-D treatment,
while cutting+ Melia azedarach treatment was significantly affected weed survivor
10 at p<0.001 compared to other applied treatments. Further hand pulling+Melia
azedratch and cutting+2, 4-D) had significant influence on pasture yield of 14.02
ton ha-1 at p<0.001 compared to other treatments. Integrated weed management
(cutting+Melia azedarach, hand pulling+Melia azedarach and cutting+2, 4-D were
more effective than single treatment when applied in high weed infestation. It is
recommended that, integrated weed management could be applied in high weed
infestation, whereas herbicides or plant extracts could be applied singly in low
weeds infested rangelands.

Author(s): NA Mwalongo*, IS Selemani, KP Sibuga, CL Rweyemamu and GF Fupi

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