Search Results

You are looking at 1 - 3 of 3 items for :

  • "galled roots" x
  • Refine by Access: All x
Clear All
Free access

H.Y. Hanna

A study was conducted in Summer 1996 and 1997 to determine the residual effects of planting nematode-resistant vs. susceptible tomato (Lycopersicon esculentum Mill.) cultivars and use of white vs. black polyethylene mulch on the growth and yield of a subsequent muskmelon (Cucumis melo L.) crop. Tomato cultivars were planted in early April and harvested in June and early July. Muskmelons were planted in late July on the same beds. Muskmelons, planted after the nematode-resistant tomato cultivar Celebrity, produced significantly greater marketable yield and more fruit per hectare in both years than did muskmelons planted after the nematode-susceptible tomato cultivar Heatwave. Plant dry weight of muskmelons was greater and the percentage of their galled roots was smaller when planted after nematode-resistant tomatoes than when planted after nematode-susceptible ones. Mulching tomatoes with black or white polyethylene had no significant effect on growth, yield, and root galling of subsequent muskmelon crops.

Full access

H.Y. Hanna

In the southern United States, the polyethylene-mulched and drip-irrigated beds remaining after the last harvest of fresh-market tomatoes (Lycopersicon esculentum) offer the potential for producing a cucumber (Cucumis sativus) crop to increase grower profit. A 2-year study of double-cropping cucumbers with `Celebrity' (nematode-resistant) and `Heatwave' (nematode-susceptible) tomato cultivars was conducted at the Red River Research Station in northwestern Louisiana to assess the benefits of this system and to determine how soon cucumbers should be planted following the termination of the tomato crop. Results indicated that cucumbers planted after `Celebrity' produced significantly greater premium and total yields per acre than did cucumbers planted after `Heatwave'. Plant fresh weight of cucumbers was greater and the percentage of galled roots was smaller when planted after `Celebrity' than when planted after `Heatwave'. Planting dates had significant effects on cucumber yield. Cucumbers planted in early July, immediately after the termination of the tomato crop produced the highest yield. Cucumbers planted in early August, 1 month after terminating the tomato crop produced an intermediate yield, and cucumbers planted in September, 2 months after the termination of the tomato crop, produced the lowest yield. A gradual decline of plant fresh weight and a gradual increase of galled-root percentage resulted from delaying cucumber planting beyond the July month. Year of planting had no significant effect on cucumber productivity, but it did influence plant fresh weight and the percentage of galled roots significantly. Average minimum temperature in September was lower than the minimum safe temperature for growing cucumbers. The combined effect of higher temperature and lower percentage of galled roots may have contributed to the increased yield of cucumbers planted in July.

Free access

Andrew P. Nyczepir, Janete A. Brito, Don W. Dickson, and Thomas G. Beckman

Rammah and Hirschmann was originally obtained from galled roots of eggplant ( Solanum melongena L.) from Puerto Rico in 1988 ( Rammah and Hirschmann, 1988 ). In 2001, M. mayaguensis was detected in the continental United States for the first time from