TABLE CONTENTS

Crop Rotation as a Management Tool for Root-knot Nematode
(Meloidogyne incognita) in Carrot
Pedroche, N.B. (1), L.M. Villanueva (1) & D. De Waele (2)
(1) Semi-Temperate Vegetable Research and Development Center, Benguet State University, La Trinidad,
Benguet, Philippines; (2) Laboratory of Tropical Crop Improvement, Department of Biosystems, Faculty of
Bioscience Engineering, Catholic University of Leuven, Leuven, Belgium
A greenhouse experiment was conducted at Benguet State University, La Trinidad, Benguet,
Philippines from 2006-2007 to assess the effect of crop rotation on root-knot nematode,
Meloidogyne incognita (Kofoid and White, 1919) Chitwood 1949 in carrot. Carrot (Daucus
carota) cultivar New Kuroda was planted as the main crop and was rotated with 6 semitemperate
vegetable crops namely, broccoli (Brassica oleraceae var. botrytis), cabbage (B.
oleraceae var. capitata), garden pea (Pisum sativum), mustard (Brassica juncea), onion leeks
(Allium cepa), snap beans (Phaseolus vulgaris) including potato (Solanum tuberosum),
strawberry (Fragaria x ananassa) and sweet corn (Zea mays var. rugosa). These rotation crops
were planted subsequently during the 2 nd and the 3 rd cropping period while carrot was planted
during the 1 st and the 4 th cropping period. The cropping sequence was as follows: (i) carrot
during the dry season of 2006; (ii) rotation crops during the dry season of early 2007; (iii)
rotation crops during the wet season of 2007; (iv) carrot during the dry season of late 2007.
Carrot in rotation with strawberry, cabbage and onion were the most effective in reducing the
population densities of M. incognita in the soil. These were significantly different (P≤ 0.05)
from the other rotation crops. Planting of carrot after strawberry exhibited the lowest number
of galls and egg masses consistent in both primary and secondary root systems of carrot in the
last cropping period. Highest marketable yield was recorded in carrot following strawberry,
broccoli and sweet corn. This information is very important in devising a suitable nematode
management strategy, specifically in the cropping systems used by marginal farmers in the
highlands.
Effect of Application Sequences of Brassica Green Manures, Mustard Seed
Meal and Nematicide on Root-knot Nematode Suppression, Starch
Reserves, Yield and Juice Characteristics in Grapevine
Rahman, L. (1) & B. Orchard (2)
(1) National Wine and Grape Industry Centre, NSW Department of Primary Industries, Locked Bag 588, Wagga
Wagga, New South Wales 2678; (2) E. H. Graham Centre, NSW Department of Primary Industries, Wagga
Wagga, New South Wales 2650.
Inter-row cultivation of brassicas may substantially reduce Meloidogyne spp in vineyards but
the optimal number of years of cultivation to reduce the population levels below damage
threshold is less known. We investigated effects of two brassicas (Indian mustard cv Nemfix,
BQMulch) as green manure, mustard seed meal and Nemacur® on the suppression of M.
javanica in soil and roots when applied in one to three consecutive years in potted Semillon
vines. Each vine was inoculated with 500 M. javanica J 2 three months after planting. Two
control treatments, infected and uninfected, were also maintained. Brassica seeds @ 20 kg/ha
were sown in early May; plants grew until early September, and then slashed and
incorporated into top soil. Mustard seed meal @ 2t/ha and Nemacur® @ 30 L/ha were also
applied on the same day. Data on nematode populations in soil and roots, starch contents in
shoots and roots, yield and juice characteristics were recorded from each treatment. Results
5 th International Congress of Nematology, 2008 284