Madras Agric. J. 92 (10-12) : 635 - 639 October-December - 2005

635

INFLUENCE OF PESTICIDE SPRAYS ON SEED QUALITY CHARACTERISTICS OF LABLAB (LABLAB PURPUREUS (L.) SWEET VAR. TYPICUS PRAIN) CV.CO 1 M. KATHIRAVAN, A. VIJAYAKUMAR and P. SRIMATHI Dept. of seed science and technology, Tamil Nadu Agricultural University, Coimbatore -641 003, Tamil Nadu Abstract : Studies were made with lablab cv. CO1 to evaluate the influence of pesticide sprays (malathion, endosulfan, and monocrotophos) on seed yield and seed quality characters including storability. The results revealed that spraying of endosulfan 0.07ml lit -1 as two sprays at 50% flowering and 15 days thereafter enhanced the seed yield and seed quality characters of resultant seed. On storage, the resultant seeds obtained from plots sprayed with endosulfan also found to have zero bruchid infestation with higher seed quality characters. Keywords: Lablab, Pesticide sprays, Bruchid infestation, Pod and seed yield.

MATERIALS AND METHODS INTRODUCTION Seed quality is a complex character, which is determined at field and preserved for successful establishment of seed crop. Though seed quality is determined by basic seed, season of production, application of nutrients, crop geometry, irrigation, and intercultural operation etc. affect seed quality. The success of all depends on the simple factor is control of pests. Pest affect both physical and physiological quality of seed in addition to health status, some of these pests influence the quality of the seed adversely both at field and at storage environments. Bruchid is the major pest of the members of Fabaceous family and these are carried from field to the store and destroy the seed in storage with in a month or two. Researchers recorded even 100 percent loss of seed due to bruchid infestation. One of the prevention method against the bruchid infestation in storage could be by checking their entry from field as egg on the seed ‘ (Patric Jasper, 1998). Field sanitation spray is one such preventive mechanism for the entry of seed into storage (Sasikala, 1994). Lablab cv. CO1 is one of important vegetable crops where seed production is important for production of vegetables. In lablab the major problem during storage is deterioation of seed quality.

Lablab cv. CO1 is a pandal type and the crop was raised with recommended package of practices at the Deportment of Seed Science and Technology, Tamil Nadu Agriculture University, Coimbatore. During crop growth, at 50% flowering the pesticides viz., malathion 50 EC 1 ml lit-1, endosulfan 0.7 ml lit-1 and monocrotophos 1 ml lit-1 were sprayed as single and double sprays. Where the second spray was given 15 days after the 1 st spray. The experimental design adopted was randomized block design with 3 replications. The unsprayed plot served as control. On maturation (49 days after anthesis) the pods were harvested and evaluated for pod, seed and seedling quality charaters viz., pod and seed yield g plant-1, pod to seed recovery, 100 seed weight, germination (%) (ISTA 1999), root and shoot length (cm), dry matter production (mg seedling -10) and vigour index (Abdul Baki and Anderson, 1973). In addition, the infestation percentage of bruchid (field carry pest) was recorded based on holes (Mohan, 1993) and reported in percentage. The seeds were taken for storage under ambient conditions upto 30 days and the quality characters viz., germination (%), root and shoot length (cm), dry matter production (mg seedling-10) and vigour index along with insect infestation were assessed. The data gathered were analyzed as per Panse and Sukhatme (1999).

636 RESULTS AND DISCUSSION The results obtained for the yield attributes of pod and seed were highly significant. Seed yield was the highest from the plants sprayed with 2 sprays of endosulfan @ 0.7 ml lit-1 and was followed by monocrotophos @ 1 ml lit -1. The lowest seed yield kg ha -1 was registered from the plants not sprayed with pesticide. The plots sprayed with endosulfon 0.7 ml lit -1 twice recorded 52 per cent higher seed yield than unsprayed plot but the seed recovery (88%) was on par with the other pesticidal sprays. The lower seed recovery was recorded from the plants sprayed with malathian @ 50 EC 1 ml lit-1 and without any spray. The 100 seed weight was non-significant due to pesticides spray however the seeds from the plants sprayed with endosulfan 0.7 ml lit-1 two sprays recorded highest 100 seed weight (37.48 g). Sasikala (1994), Vijayakumar (1996) and Patric Jasper (1998) opined the effective control of the pests, concomitant with the maintenance of plant health and photosynthetic efficiency caused higher yield and higher recovery of large sized seeds in cowpea, bhendi and peas, respectively. Sekharan (1978) in sesame also observed seed weight enhancement with pesticidal spray. Such increased seed weight due to pesticidal spray had also been reported by Viswanathan (1979) in cotton, Sudha (1984) in cotton and Vijayakumar (1996) in bhendi. Among the treatments, the resultant seeds obtained from the plants received two sprays of endosulfan 0.7 ml lit-1 registered highest germination (94%) while the resultant seeds from the control plots registered the lower germination of 74 per cent. The vigour characters measured in terms of root and shoot length (cm), dry matter production (mg seedling-10) and vigour index, were higher for the resultant seeds obtained from the plants received two spray of endosulfon 0.7 ml lit-1 compared to unsprayed plots. The resultant seeds from the pesticide sprayed plots also recorded higher seed quality characters than the resultant seeds from unsprayed plot. Similar seed quality improvement in resultant seeds, due to field sanitation sprays were also reported by Jayaraj and Karivaratharaju (1987) in

M. KATHIRAVAN, A. VIJAYAKUMAR and P. SRMATHI

sesame, krishnasamy (1990) in egg plant and Patric Jasper (1998) in pea, while Chatterje et al (1966) expressed the cause for hike in seedling vigour characteristics as the terminal residual effect of pesticides which favour the production of gibberellic acid. Seedling vigour improvement in resultant seed due to pesticidal spray was also observed by Sudha (1984) in cotton, Tonapi (1988) in sorghum, Khoe (1992) in paddy and Patric Jasper (1998) in peas. The storability of seeds assessed after a month of storage period (30 days) expressed that the seed quality characters were maximum for the resultant seeds from the plots sprayed with endosulfan 0.7 ml lit-1 (two spray) and was followed by monocrotophos 1 ml lit-1, malathion 50 EC 1ml lit’one spray and two spray, respectively. Significant control of bruchid due to pestcide spray treatment was observed compared to control. The zero bruchid infestation was registered for the resultant seeds from the plots sprayed with endosulfan 0.7ml lit-1 two spray and infestation was 0.53% with monocrotophos 1 ml lit-1 as two spray compared to control which recorded 16% of bruchid infestation. The treatment endosulfan 0.7 ml lit-1 in two sprays controlled the field carryover of bruchid, which is the main reason for better maintenance of seed quality during storage. All the pesticide spray treatments had quality character both initially and after storage compared to the seeds of unsprayed plot. In the present study also the efficacy of double spray was found to be higher irrespective of pestcide compared to single spray, not only for seed quality characters but also the yield characters. Vijayakumar (1996) in bhendi, Patric Jasper (1998) in peas also opined that pesticides as pre harvest spray just 10 days before harvest found to enhance the seed yield due to the control of insect infestation and the maintenance of seed quality characters including storability of seeds as a result of lower degree of field carry over pest to storage. Thus the study indicated that spraying of endosulfan 0.7 ml lit-1 twice during 50% flowering followed with another spray 15 days after 1 st spraying enhanced seed yield and seed quality characters.

INFLUENCE OF PESTICIDE SPRAYS ON SEED QUALITY CHARACTERISTICS OF LABLAB (LABLAB PURPUREUS (L.) SWEET VAR. TYPICUS PRAIN) CV. CO1

REFERENCES Abdul-Baki, A.A. and Anderson J.D. (1973) Are changes in cellular organelles and membranes related to vigour loss in seeds? Seed Science Technol, 1: 89-125. Chatterjee, UN, Sankhla N. and Baxi D. (1966). Preliminary studies of the effects of certain growth substances on germination of Sesamum indicum L. Seeds Indian Agric, 10(1): 45-51. ISTA. (1999) Seed Sci. and Technol, 27: Supplement rules, 27-31. Jayaraj, J. and Karivaratharaju T.V. (1987). Effect of Pesticides spray on seed quality in sesame. Seed Res. 15(2): 160-163. Khoe, N.T. (1992). Influence of supplemental preharvest sanitation application of insecticides on seed quality characteristics of rice. M.Sc. (Ag.) Thesis, TNAU, Coimbatore. Krishnasamy, V. (1990). Effect of insecticide application on seed yield and quality in egg plant (Solatium melangena L.). Journal of Applied Seed Production, 8: 1-5. Mohan, S. (1993). Field infestation of callosoburchus maculatus F. in redgram. Pestology, 20(10):27. Panse, V.G. and Sukhatme P.V. (1999). Statistical methods for agricultural workers, ICAR Pub., New Delhi.

637

Patric Jasper. (1998). Studies on seed production and storage aspects of pea (Pisum sativum L.) M.Sc. (Ag.) Thesis, Tamil Nadu Agricultural University, Coimbatore. Sasikala, K. (1994). Studies on the influence of preharvest spraying of pesticides on seed yield and quality in cowpea cv. CO.4 M.Sc.(Ag.) Thesis, Tamil Nadu Agricultural University, Coimbatore. Sekharan, S. (1978). Seed quality in sesame (Sesamum indicum L.) cv. KRR 2 and TMV 3 influenced by the pesticide applied to mother crop. M.Sc. (Ag.) Thesis, TNAU, Coimbatore. Sudha, K. (1984). Studies on certain aspects of seed quality in cotton (Gossypium hirsutum) M.Sc. (Ag.) Thesis, TNAU, Coimbatore. Tonapi, V.A. (1988). Studies on the effect of harvesting conditions on vigour potential viability and storability of seeds in sorghum genotypes (Sorghum bicolor L. moench). Ph.D., Vijayakumar, A. (1996). Seed Technological Studies in bhendi (Abeluoschus esculentus L. Monench). Ph.D. Thesis, TNAU, Coimbatore. Viswanathan, T. (1979). Evaluation of Endosulfan (Endocel 35 EC) for the control of Major pest of cotton. M.Sc. (Ag.) Thesis, TNAU, Coimbatore.

638 Table 1.

M. KATHIRAVAN, A. VIJAYAKUMAR and P. SRMATHI

Influence of pesticide spray on pod and seed yield of lablab cv. CO 1

Treatment

Pod yield plant -1(g)

Seed Yield plant -1 (g)

Pod to seed recovery (%)

100 seed weight (g)

138

95

64

35.15

Malathion 50EC lml 1 (One spray)

145

109

75

36.47

Malathion 50EC lml 1-1 (Two spray)

156

130

84

37.18

Endosulfan 0.7ml 1-1 (One spray)

152

125

82

36.81

Control -1

-1

Endosulfan 0.7ml 1 (Two spray)

164

144

88

37.48

-1

148

122

82

36.57

-1

160

137

85

37.38

SEd

1.665

1.587

2.589

NS

CD (P=0.05)

3.627

3.457

5.641

Monocrotophos lml 1 (One spray) Monocrotophos lml 1 (Two spray)

Table 2. Influence of pesticide spray on resultant seed Treatment

Germination (%)

Root Shoot length (cm) length (cm)

Dry matter Vigour production index (mg seedling-10)

Control

74(59.23)

27.1

29.3

136

4175

Malathion 50EC lml 1-1 (One spray)

79(62.90)

27.6

29.9

147

4562

Malathion 50EC lml 1-1 (Two spray)

88(70.13)

28.5

31.9

160

5309

-1

84(69.25)

28.1

31.3

156

4988

-1

Endosulfan 0.7ml 1 (Two spray)

94(76.55)

28.7

32.1

168

5720

Monocrotophos lml 1-1 (One spray)

82(65.62)

27.9

30.9

152

4830

Monocrotophos lml 1 -1 (Two spray)

90(75.10)

28.6

31.9

165

5451

SEd

1.600

0.014

0.013

1.309

73.733

CD (P=0.05)

2.527

0.031

0.028

2.852

160.65

Endosulfan 0.7ml 1 (One spray)

Figures in parenthesis indicate transformed values

Treatment

Germination Root Shoot Dry matter (%) length (cm) length (cm) production

Vigour Bruchid index infestation (mg seedling-10) (%)

Control

58(47.89)

26.5

29.1

133

3222

16 639

Malathion 50EC lml 1-1 (One spray)

60(50.77)

27.2

29.4

145

3395

3.4

Malathion 50EC lml 1-1 (Two spray)

78(62.04)

27.9

31.5

153

4636

1.1

Endosulfan 0.7ml 1-1 (One spray)

72(58.06)

27.8

31.1

152

4239

1.66

Endosulfan 0.7ml 1-1 (Two spray)

88(70.13)

28.6

31.9

164

5300

0

Monocrotophos lml 1-1 (One spray)

68(55.56)

27.5

30.3

145

3923

2.4

Monocrotophos lml 1-1 (Two spray)

84(69.25)

28.6

31.6

161

5049

0.53

1.595 3.475

0.184 0.401

0.080 0.174

0.835 1.821

139.91 304.85

0.306 0.666

SEd CD (P=0.05)

Figures in parenthesis indicate transformed values

influence of pesticide sprays on seed quality ...

pod and seed yield g plant-1, pod to seed recovery, ... The data gathered were analyzed as per Panse and ... than unsprayed plot but the seed recovery (88%).

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