DISEASES
Screening of cultivars/lines against bacterial wilt Out of six genotypes of tomato (Table 1), the least wilt infestation (8.5%) was recorded in Megha Tomato- 1 with a yield of 34.37 t/ha followed by in the genotype US-625 (10.67%) with a yield of 39.15 t/ha. The wilting was highest (65 %) in the genotype Pusa Ruby with an average yield of 18.75 t/ha.
BRINJAL
Evaluation studies (long type)
Fifteen genotypes of brinjal (long type) were evaluated for yield and related traits. The highest yield was recorded in the genotype RCMBL-2 (35.84 t/ha) followed by Arka Nidhi (32.16 t/ha) and Singh Nath (30.56 t/ha). However, least yield was recorded in the genotype Pongal Pink (23.91 t/ha).
DISEASES
Screening of cultivars/lines against bacterial wilt Among the genotypes (Table 2) the least bacterial wilt incidence (6.75%) with an average yield of 28 t/
ha was recorded in Bhola Nath followed by RCMBL- 3 (7%) with an average yield of 35.65 t/ha. The wilting (72%) was highest in the genotype PPL with an average yield of 7.50 t/ ha.
Fig 1 Megha tomato-1
Fig 2 Tomato cultivation under protected condition
Table 1 Performance of tomato genotype against bacterial wilt
Entries Fruit length Fruit breadth Average TSS (0B) Yield (t/ha) Wilt (%)
(mm) (mm) fruit wt (g)
US-625 53.10 69.50 108.33 4.55 39.15 10.67
BT-317 42.58 54.47 55.00 4.25 25.62 35.00
BMZ-21 53.69 43.77 47.00 4.75 30.00 23.25
Megha Tomato-1 49.47 54.45 110.00 4.80 34.37 8.50
BT-1(C ) 54.84 56.32 95.00 5.00 33.12 13.67
Pusa Ruby ( C) 55.00 45.35 45.00 4.60 18.75 65.00
Table 2 Performance of brinjal genotypes against bacterial wilt
Entries Plant height Fruit length Average fruit wt Yield Wilt
(cm) (cm) (g) (t/ha) (%)
RCMBL-3 68 14.00 120 35.66 7.00
BB-54 65 10.25 105 30.94 10.00
Singh Nath 72 22.00 145 30.56 8.00
Bhola Nath 66 12.75 115 28.00 6.75
Utsav 75 14.33 110 31.44 10.50
SM-6-6 (C) 57 10.45 85 25.16 12.25
Arka Nidhi (C ) 64 15.71 88 32.16 9.20
PPL (SC) 55 12.55 110 7.50 72.00
CHILLI
Evaluation under low cost polyhouse
Four collections of King chilli (Capsicum chinense) were evaluated for the different characteristics (Fig 3). The average fruit weight and length varied from 1.25-3.8 g and 3.5-7.5 cm, respectively. The maximum fruit weight was recorded from RCKC-1(3.40 g). The plant height varied from 85-150 cm. The fruit yield per plant ranged from 650-1250 g.
A molecular diversity analysis was carried out with 38 chilli accessions. Thirty five accessions were King chillies collected from Assam, Arunachal Pradesh, Nagaland and Manipur, and one accession each of Capsicum annum (g7), C. fruitescence (g25) and C.
baccatum (g23). Twenty IISR markers were used for analysis of diversity. Based on amplification pattern, similarity values were calculated, genotypes were grouped using cluster analysis and the results are presented below as a dendogram (Fig 4). Average
similarity ranged from 65 – 94%. Two major groups were identified. One group included 16 King chilli genotypes along with C. annum and C. fruitescence.
The other group included 18 King chilli genotypes and C. baccatum. The distances of Capsicum annum, C.
fruitescence and C. baccatum from King chilli was almost similar.
FRENCH BEAN
Evaluation studies (bush type)
Twelve genotypes of French bean (bush type) were evaluated during 2010 (rainy season). The highest yield was recorded from the genotype Arka Suvidha (10.25 t/ha) followed by Contender (9.75 t/ha) and FBBVAR- 2 (9.7 t/ha), however, least yield was obtained in the genotype FBBVAR-4 (6.25 t/ha). The maximum pod length was recorded in Arka Anoop (15.7 cm) followed by FBBVAR-4 (15.4 cm).
ASH GOURD
Evaluation of genotypes
Five entries of ash gourd were evaluated for yield and related traits. The highest yield (41.0 t/ha) was recorded in the genotype RCAG-15 (Fig 5) followed by RCAG-28 (36.8 t/ha). However, least yield was redorded in the genotype KAG-1 (28.2 t/ha). The average fruit weight was recorded maximum in the RCAG-28 (4.7 kg) followed by RCAG-15 (3.60 kg)
CARROT
Evaluation of carrot genotypes
Out of six genotypes, highest yield was recorded in the New Kuroda (16.94 t/ha) followed by Nantes (15.0 t/ha), whereas least yield was obtained in the genotype No-286 (10.56 q/ha). The root length was also maximum in the genotype New Kuroda.
Fig 3 Diversity in King Chilli collections
Fig 4 Dendogram showing similarity coefficients (J) and clustering (SHAN) pattern of King chilli
genotypes and three species of chilli
Fig 5 RCAG-15
ONION
Varietal performance
Four genotypes of kharif season onion (Source:
Directorate of Onion and Garlic Research, Rajgurunagar) were evaluated. The seeds were sown on 15th June and seedlings were transplanted during 1st week of August. The highest yield was recorded in cultivar Bhima Super (33.50 t/ha) followed by Bhima Raj (31.75 t/ha). However, the average bulb weight was highest in the cultivar Bhima Raj (61g) followed by Bhima Red (54.4 g).
OKRA
Multilocation trial
Under MLT of okra germplasm (NBPGR New Delhi), 135 genotypes were evaluated during the kharif season. The highest average yield per plant was recorded from the genotype IC-117140 (633.87 g) followed by IC- 013664 (557.30 g) and VRO-6 (479.35 g).
CABBAGE Evaluation studies
Eight hybrids of cabbage were evaluated for different traits. The highest yield (80.64 t/ha) was recorded in the cabbage Hybrid-4 with maximum harvest index (0.80) followed by check Hybrid-139 (70.30 t/ha). The lowest yield was recorded in the genotype Kranti (23.8 t/ha). The earliest maturity was seen in check Hybrid-139 (66.67 days). The head compactness was highest in the hybrid Kranti (77) followed by cabbage Hybrid-4 (75.64).
INSET PESTS
Bio-intensive management of cabbage butterfly Eco-friendly pesticides were evaluated against cabbage butterfly (Pieris brassicae) under field conditions, spinosad @ 0.01% was found to be very effective followed by Lipel 8 SP @ 2g/L, B. bassiana (1x109 cfu/ml) @ 6 ml/l and NSKE 5%. The reduction in damage by spinosad, Lipel (Bt var. kurstaki), B.
bassiana (1x109 cfu/ml) and NSKE 5% were 60.82%, 50.16%, 41.82% and 40.38%, respectively as compared to control.
TUBER CROPS
Evaluation of sweet potato
Twenty three sweet potato genotypes were evaluated for yield and other characters. The highest
tuber yield of (29.41 t/ha) was recorded in the genotype S-107. The maximum tuber length (24.90 cm) was recorded in Meghalaya Local, whereas, tuber diameter was highest (9.98 cm) in the variety Pol 21 – 1.
Under MLT, out of six genotypes (Table 1), the highest yield was recorded from Kokrajhar Local (29.41 t/ha) followed by S 107 (28.23 t/ha). However, the dry matter percentage was highest in the genotype Sree Bhadra (30.33%) followed by S 107 (28.67%) with least weevil damage (10%).
Table 1 Performance of sweet potato genotypes under multi location trials
Varieties Tuber Dry Weevil Harvest
yield matter damage index
(t/ha) (%) (%) (%)
S-107 28.23 28.67 10.00 40.33
Kokrajhar local 29.41 26.00 12.67 40.33 Kokrajhar red 25.55 27.00 14.00 46.67 Sree Bhadra 26.90 30.33 11.33 52.33 Meghalaya local 21.02 24.67 12.33 48.33
S.E. (m) 2.00 0.81 0.83 1.26
CD (P=0.05) 6.22 1.87 1.91 2.91
Evaluation of colocasia genotypes
Forty genotypes of colocasia were evaluated for their yield and yield attributing characters. Plant height was highest in IG Coll-5 (76.33 cm). The maximum number of side shoots per plant (8.50) was found in ARCol-8. The variety Nainital recorded the highest number of cormels/plant (30.33) followed by BCC-2 (26.00). The variety BCC-1(A) exhibited the lowest number of cormels/plant (3.67). The highest cormel yield (15.38 t/ha) and total yield (26.01 t/ha) was recorded in the variety White Gauriya.
Standardization of storage techniques for taro seed tuber
This experiment was conducted with the genotype ML-1 during 2010 and minimum sprouting % was recorded in the treatment T4 (cormels treated with carbendazim (0.05 %) and stored in pacca floor) which varied from 27.33% in 30 days to 52.67% in 120 days after storage followed by T5 (cormels treated with Trichoderma viride (0.05 %) and stored in pacca floor).
Similarly, minimum rotting percentage and minimum reduction in starch content was recorded in the treatment T4 followed by T5. However, maximum shelf life (192.66 days) was observed in the treatment T7 (cormels treated with carbendazim (0.05 %) and stored in pits followed by T4 (183 days) and T5 (181 days).
Similarly, the weight losses of cormels were least in (T7).
DISEASES
Study on severity of leaf blight in colocasia Out of six colocasia (taro) genotypes (Table 2), the highest yield was recorded from ML-1(22.13 t/ha) followed by ML-9 (19.13 t/ha) with least incidence of leaf blight 20.17% and 20.83%, respectively. However, the disease severity was highest in the genotype Megha-1 throughout the growing season.
Table 2 Severity of leaf blight in colocasia
Varieties Yield Leaf Disease severity index (t/ha) blight
(%) 2 4 6
(60 (120 (180 DAP)* DAP) DAP)
ML-1 22.13 20.17 14.58 22.92 35.42
ML-2 18.68 22.92 12.50 18.75 27.08
ML-9 19.13 20.83 10.42 18.75 29.17
Megha-1 17.51 45.83 20.83 33.33 50.00
BCC-1 12.51 31.25 14.58 25.00 39.58
Meghalaya local 17.00 22.92 12.50 18.75 27.08
S.E. (m) 1.28 2.90 3.18 1.86 2.46
CD (P=0.05) 2.85 6.46 7.09 4.14 5.48
* DAP: Days after planting