Search Results

You are looking at 31 - 40 of 1,731 items for :

  • "introduction" x
  • Refine by Access: All x
Clear All
Full access

Brent Rowell and Mar Lar Soe

season in Myanmar (see also Fig. 9 ). Farmers’ field testing and demonstrations First introductions, 2007–08 Ten small, preliminary farmers’ field tests were established in Jan.–Mar. 2007. In most cases our plots consisted of 300–600 ft of drip laterals

Free access

Paul G. Thompson, John C. Schneider, Boyett Graves, and R. Crofton Sloan Jr.

One hundred U.S. sweetpotato [Ipomoea batatus (L.) Lam.] plant introductions (PIs) and four control cultivars were screened for insect injury in 1993. Of the least injured by insects, 56 and 31 were tested again in 1994 and 1995, respectively. Among control cultivars, the most highly resistant was `Regal' (moderately resistant), followed by `Beauregard' (susceptible), `Centennial' (susceptible), and `Jewel' (susceptible). Stem and root injury by the sweetpotato weevil (SPW) [Cylas formicarius elegantulus (Summers)] and root injury by the wireworm (Conoderus sp.)–Diabrotica sp. (cucumber beetle)– Systena sp. (flea beetle) (WDS) complex were measured. SPW stem injury was less severe (P ≤ 0.05) in 1994 and 1995 in PIs 508523, 531116, and 564107 than in control cultivars. PIs 508523 and 531116 also suffered less SPW root injury than did `Regal'. In the six PIs with least SPW root injury, PIs 538354, 564149, 508523, 538286, 531116, and 564103, 70% to 85% of the roots were not injured compared with 36% in `Regal' and 6% in `Jewel'. SPW root injury scores (0 = no injury; 5 = severe injury) in those PIs averaged 0.5 vs. 2.3 for `Regal'. Only in PI 538286 was WDS injury to roots less than in `Regal' over 2 years. However, eight additional accessions suffered less WDS injury than `Regal' in 1995 and four of those were among the six with least SPW injury. The lower levels of combined insect injury found in these four PIs (compared to `Regal') show that PIs have potential use for increasing insect resistance in sweetpotato improvement programs.

Free access

Yukihiro Fujime

vegetables are not enough ( Organizing Committee of JSHS, 1994 ). The following is an introduction to the indigenous vegetables in Japan. LAND, NATURAL CONDITIONS, AND CLIMATES OF JAPAN The Japanese islands are long from south to north between north latitude

Free access

Chandrasekar S. Kousik, Scott Adkins, William W. Turechek, and Pamela D. Roberts

in wild relatives of the cultivated watermelon. In this article, we present results of greenhouse and field evaluation of the watermelon core collection of U.S. plant introductions (PIs) for resistance to SqVYV. Parts of this study have been

Free access

C. Michael Bourget

. Holonyak, and F.A. Kish. 2001. In pursuit of the ultimate lamp. Sci. Amer. 284:63–67. Lighting Design Lab. 2008. Introduction to LED lighting. Mar. 2008. < http://lightingdesignlab.com/articles/LED_fund/intro_ledfund.htm >. Philips Lumileds Lighting

Free access

Beiquan Mou and Guangyao Wang

to meet people’s nutritional needs. The plant-based food has contributed to the generally slim bodies of Asian people. However, with the introduction of high-fat, high-sugar, and high-calorie fast food in recent years, obesity and obesity

Free access

E. Barclay Poling

, Sjulin, and Smith, there seemed to be considerable question about the short-term usefulness of current resistant cultivars, such as the 1992 University of Florida introduction, Sweet Charlie, which is resistant to AFR ( Chandler and Legard, 2003

Free access

Paul G. Thompson, John C. Schneider, and Boyett Graves

One hundred plant introductions (PIs) were evaluated for sweetpotato-weevil resistance in experiment station field trials for 2 years in Beaumont, Miss. Weevil infestation was accomplished by applying adult weevils in year 1 and weevil infested roots in year 2. The percentage of uninjured roots ranged from 38% in `Centennial', the susceptible control, to 93% in PI538288. Severity of root and stem injury were measured in year 2. Stem injury ratings on a scale of 0, for no injury, to 4, for severe injury, ranged from 1.2 in PI564113 to 3.7 in `Beauregard'. Root injury ratings on a scale of 0 to 5 ranged from 0.1 in PI538288 to 4.2 in `Beauregard' (susceptible control). Thirty-five PIs had lower root injury values than `Regal' (resistant control), and the percentage of uninjured roots was higher in 45 PIs than in `Regal'. These results suggest that genes are available in PIs for increased levels of weevil resistance in sweetpotato.

Free access

Jules Janick

Salt Lake City, UT, at the 94th Annual Conference of the American Society for Horticultural Science (ASHS) in 1999. That workshop, after an introduction by Chad E. Finn (1999) , contained papers on chiles by Paul W. Bosland (1999) ; vegetable uses of