The present invention relates to compounds of Formula (I), or an agronomically acceptable salt of said compounds wherein Q, R.sup.1, R.sup.3, R.sup.4 and n are as defined herein. The invention further relates to herbicidal compositions which comprise a compound of Formula (I) and to the use of compounds of Formula (I) for controlling weeds, in particular in crops of useful plants.

##STR00001##

A new type of defoliant and the application thereof, specifically the application of a polyether compound in the preparation of defoliant, belonging to the technical field of pesticides. At least one of the polyether compound shown in Formula I (R.sub.1O(CH.sub.2CHOH).sub.nR.sub.2) or salts thereof is used for preparation of defoliants or defoliation synergists, wherein, the R.sub.1 is a hydrocarbyl or a phenolic group; the R.sub.2 is —H, —O(CH.sub.2CHOH).sub.mH or —O(CH.sub.2CH.sub.2CHOH).sub.mH; the n is 1-50, and m is 1-50. The compound is a new defoliant featured with low cost, convenient usage and favorable defoliation effect, and it is safe for the environment.

A new type of defoliant and the application thereof, specifically the application of a polyether compound in the preparation of defoliant, belonging to the technical field of pesticides. At least one of the polyether compound shown in Formula I (R.sub.1O(CH.sub.2CHOH).sub.nR.sub.2) or salts thereof is used for preparation of defoliants or defoliation synergists, wherein, the R.sub.1 is a hydrocarbyl or a phenolic group; the R.sub.2 is —H, —O(CH.sub.2CHOH).sub.mH or —O(CH.sub.2CH.sub.2CHOH).sub.mH; the n is 1-50, and m is 1-50. The compound is a new defoliant featured with low cost, convenient usage and favorable defoliation effect, and it is safe for the environment.

An object of the present invention is to provide an F1 hybrid or a portion thereof, and use of the F1 hybrid or a portion thereof. The F1 hybrid of the present invention is an F1 hybrid between Nicotiana umbratica and Nicotiana kawakamii.

The present invention relates to compounds of Formula (I), or an agronomically acceptable salt of said compounds wherein Q, R.sup.1, R.sup.2, R.sup.4 and n are as defined herein. The invention further relates to herbicidal compositions which comprise a compound of Formula (I) and to the use of compounds of Formula (I) for controlling weeds, in particular in crops of useful plants.

##STR00001##

The present invention relates to compounds of Formula (I), or an agronomically acceptable salt of said compounds wherein Q, R.sup.1, R.sup.2, R.sup.4 and n are as defined herein. The invention further relates to herbicidal compositions which comprise a compound of Formula (I) and to the use of compounds of Formula (I) for controlling weeds, in particular in crops of useful plants.

##STR00001##

The present invention relates to compounds Formula (I) wherein Q, R.sup.2, R.sup.3 and R.sup.4 are as defined herein. The invention further relates to compositions comprising said compounds, and methods of controlling weeds using said compounds and/or compositions.

The present invention relates to compounds Formula (I) wherein Q, R.sup.2, R.sup.3 and R.sup.4 are as defined herein. The invention further relates to compositions comprising said compounds, and methods of controlling weeds using said compounds and/or compositions.

An isoxazoline compound with optical activity is shown in the formula (I). The compound of the formula (I) has excellent herbicidal activity, can be used for weeding pre- and post-emergence, and can also be used for soil treatment. The compound of the formula (I) can effectively control various broad-leaved weeds, grass weeds and Cyperaceae weeds, and can control various resistant weeds, such as glyphosate-resistant weeds. The excellent weeding effect can be obtained at a low dose. The compound has good safety to crops such as corn, wheat, rice, soybean and sugar beet. The compound can be used as a selective herbicide in crop fields in agriculture, and can also be used as a non-selective herbicide in non-cultivated land, fallow land, woodland, orchards and ridges.

##STR00001##

Provided are methods to control growth of weed plants. The methods involve the application of a liquid formulation comprising a herbicidally effective amount of a thiocyanate preparation or isothiocyanate preparation to the foliage of weed plants. The thiocyanate preparation or isothiocyanate preparation can be provided in the form of a glucosinolate hydrolysate.