Potato is a strategic crop in Tunisia but is susceptible to many pests and diseases. Nematodes of the genera Meloidogyne and Globodera are important pests that cause yield losses and depreciation of tuber quality. A trial was carried out in a plot where the soil was naturally infested with M. javanica and G. pallida. Three soil treatments were tested and compared. Soil solarization (SS) and inc...

In this paper we consider dynamic routing on trees under the \matching with consumption" routing model, a natural extension of the matching routing model introduced by Alon, Chung and Gra-ham 1, 2], which allows for the consumption of packets when they reach their destination. We present an asymptotically optimal on-line algorithm that routes k packets to their destination within d(k ? 1) + d d...

We study the possibility of achieving efficiency in a dynamic adverse selection market for durable goods. The idea is to use the number of times a car has been traded (“vintage”) as a signal of its quality. Higher-valuation consumers experiment with younger vintages. We first exhibit an impossibility result: no choice of (re)sale prices can induce consumers to follow this experimentation policy...

This paper introduces hot potato high level synthesis transformation techniques. These techniques add deflection operations in the behavioral description of a computation in such a way that the requirements for two important components of the final implementation cost, the number of registers and the number of interconnects, are significantly reduced. Moreover, it is shown how hot potato techni...

We give a finiteness criteria for the potato-peeling p b l m that asks for the largest convex polygon (‘potato’) contained inside a given simple polygon, answering a question of J. Goodman. This leads to a polynomial-time solution of O(n91og M ) . The techniques used turn out to be useful for other cases of what we call the polygon incluswn and enclosure problem. For instance, the largest perim...

Parthenogenesis, a natural form of asexual reproduction produced from unfertilized eggs, occurs in many insects in Hemiptera and Hymenoptera, but very rarely in Lepidoptera. The current study aimed to test the larval density dependent occurrence of parthenogenesis in potato tuber moth, Phthorimaea operculella (Zeller; Lepidoptera: Gelechiidae) under laboratory conditions. More than 10% of femal...

This study established a new system for potato transformation using toxoflavin as selection agent and toxoflavin lyase (tflA) as selectable marker gene. Potato plants expressing tflA was successfully transformed on toxoflavin medium with 27% efficiency, similar to that for the hygromycin/hpt selection system. The transgenic potato expressing tflA also showed resistance to Burkholderia glumea in...

The new Liberibacter species, 'Candidatus Liberibacter solanacearum' (Lso) recently associated with potato/tomato psyllid-transmitted diseases in tomato and capsicum in New Zealand, was found to be consistently associated with a newly emerging potato zebra chip (ZC) disease in Texas and other southwestern states in the USA. A species-specific primer LsoF was developed for both quantitative real...

The present study was conducted to assess the suitability of blends of two sweet potato (creamand yellowflesh) varieties and maize flours in the preparation of crunchy snacks. Each of the sweet potato varieties was prepared into flour and separately blended with 0, 30 and 50% of maize flour. The blends were evaluated for proximate composition, mineral content, vitamin content, anti-nutrient fac...

Two digestion experiments were conducted to determine the effect of various levels of potato processing residue in feedlot diets on digestion of dry matter, gross energy, crude protein and starch. In Exp. 1, 10 Hereford steers (average weight 360 kg) were randomly allotted to one of five diets in which (1) 0, (2) 15, (3) 30, (4) 45 or (5) 60% of diet dry matter was provided by potato processing...