Browsing by Author "Jose, P C"

Filter results by typing the first few letters
Now showing 1 - 7 of 7
  • No Thumbnail Available
    Item
    Bio-deterioration of important vegetable seeds due to mycoflora II
    (Department of Plant Pathology, College of Horticulture, Vellanikkara, 1991) Ambika, S; Jose, P C
    Bio-deterioration of important vegetable seeds due to mycoflora-II" was studied at the Department of Plant Pathology, College of Horticulture, Vellanikkara during the year 1988-89. Three vegetable seeds viz., bhindi (Abelmoschus esculentus (L.) Moench), cowpea Vlqna unquiculata (L.l Walp) and dolichos bean (Dolichos 1ablab L .) were used for the investigations. The objectives of the investigations were 1. To assess the role of seed-borne mycoflora and bio-deterioration of important vegetable seeds (bhindi, cowpea and dolichos bean)2. To study the influence of seasons on the association of seed-borne mycoflora of stored vegetable seeds 3. To assess the effect of relative humidity on the viability of vegetable seeds 4. To study the role of seed mycoflora on the germination of seeds and 5. To find out the effect of fungicides to minimise the fungal bio-deterioration of stored vegetable seeds.
  • No Thumbnail Available
    Item
    Effect of bunchy top virus infection on the chemical constituents of banana fruits
    (Kerala Agricultural University, 1971) Jose, P C; Balagopal, C; Wilson, K I; Nambiar, B P
  • No Thumbnail Available
    Item
    Effect of some insecticide granules on the control of the banana aphid Pentalonla nigronervosa Coq.
    (Kerala Agricultural University, 1973) Nair, M R G K; Jose, P C; Reghuxath, P; Gangadharan Nair, N
  • No Thumbnail Available
    Item
  • No Thumbnail Available
    Item
    Mosaic disease of Calotropis gigantea R. Br.
    (Kerala Agricultural University, Vellanikara, 1967) Wilson, K I; Jose, P C
  • No Thumbnail Available
    Item
    Reaction of different varieties of banana against bunchy top disease
    (Kerala Agricultural University, 1981) Jose, P C
  • No Thumbnail Available
    Item
    Varietal screening of banana against anthracnose disease
    (Department of Plant Pathology, College of Horticulture, Vellanikkara, 1984) Srinagesh, K L; Jose, P C
    Laboratory and field studies of the varietal screening of banana against anthracnose disease were conducted at the college of Horticulture. Vellanikkara and at Banana Research Station, Kannara respectively during 1981-1983. In the field the infection started at the distal end of the banana fruit and in course of time the infected fruit became blackened, shriveled and mummified. After Harvest, the symptoms appeared as small brown spots which enlarged quickly and coalesced forming larger patches. The affected areas were covered with orange to salmon pink coloured conidial masses. The detailed morphological studies of the fungus proved that the anthraemose disease of banana is caused by colletrichum cloeosporioides cooko and massee, the imperfect stage of glomerella cinoulata spauld and shrenk. Twenty five varieties of banana fruit were screened in vitro at different stages of development against anthracnose disease. The varieties showed different degrees of susceptibility at various developmental stages of the fruit. The pooled analysis of the data showed that the variety nendra padaththi followed by palayankodan, jurmani kunthali, boodida bontha bathes, peyan, kanchikela, pisang mas and kapok were found to be highly resistant. The varieties Zanzibar, adakka kunnan, klue teparod, chinia, nendran, venneettu mannan, koduppilla kunnan, hybrid sawai, poocha kunnan, red banana and boodles altafort were found to be resistant to the disease. The variety robusta was found to be susceptible. The varieties njalipoovan, pisang lilin, dwarf Cavendish, matti and gros Michel were found to be highly susceptible. The major chemical constituents of banana fruit viz. reducing sugars, total sugars starch, crude fibre, crude protein and tannin at different developmental stages of twenty five varieties were analysed. The reducing sugars and total sugar were found to increase steadily from immediately after female phase to ripened stage in all the varieties. The starch and crude fibre contents, though increased steadily upto full maturity. Declined sharply at the ripening stage. The crude protein and tannin contents were maximum at immediately after female phase but steadily decreased and were minimum at ripening phase. There was a significant positive correlation between reducing sugars, total sugars and per cent disease intensity at three fourth maturity. High sugars were responsible for susceptibility to the disease. A significant negative correlation was obtained between crude protein and per cent disease intensity at half maturity. A significant negative correlation was also obtained between tannin and per cent disease intensity at one fourth and half maturity stages. High crude protein and high tannin contents were responsible for resistance to the disease.